The TPD5S115 device is an integrated HDMI companion chip solution. The device provides a regulated 5-V output (5VOUT) for sourcing the HDMI power line. The regulated 5-V output supplies up to 55 mA to the HDMI receiver with a current limiting function. The TPD5S115 features two control signals: EN and LS_OE. The control of 5VOUT and the hot plug detect (HPD) circuitry is independent of the LS_OE control signal and is controlled by the EN pin. The EN pin allows the detection scheme (5VOUT + HPD) to be active before turning on the whole HDMI link. The LS_OE activates the internal LDO, CEC, SCL, and SDA buffers only when EN is also activated. This dual stage enable scheme ensures optimized power saving for portable applications.
There are three noninverting, bidirectional, voltage level translation circuits for the SDA, SCL, and CEC lines. Each have a common power rail (VCCA) on the A side from 1.1 V to 3.6 V. On the B side, the SCL_B and SDA_B each have an internal 1.75-kΩ pullup connected to the regulated 5-V rail (5VOUT). The DDC (SCL_B and SDA_B) pins meet the I2C specification and drive up to 750-pF loads with the buffers. The CEC_B pin has an internal 27-kΩ pullup to an internal 3.3-V supply. The TPD5S115 exceeds the IEC61000-4-2 (Level 4) ESD protection level. This device features a space saving, 1.72-mm × 1.72-mm, YFF package with 0.4-mm pitch.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPD5S115 | DSBGA (16) | 1.72 mm × 1.72 mm |
Changes from C Revision (December 2016) to D Revision
Changes from B Revision (March 2013) to C Revision
Changes from A Revision (February 2013) to B Revision
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
5VOUT | C1 | O | DC-DC output. The 5-V power pin can supply a 55-mA regulated current to the HDMI receiver. A separate DC-DC converter control pin (EN) disables the DC-DC converter when operating at low-power mode |
CEC_A | D3 | I/O | LS system side CEC bus I/O. This pin is bidirectional and referenced to VCCA |
CEC_B | B1 | I/O | LS HDMI connector side CEC bus I/O. This pin is bidirectional and referenced to the 3.3-V internal supply |
EN | C3 | C | DC-DC enable. Enables the DC-DC converter and HPD circuitry when EN is HIGH. The EN is referenced based off VCCA |
GND | A2 | G | Device ground |
HPD_A | B4 | O | System side output for the hot plug detect. This pin is unidirectional and is referenced to VCCA |
HPD_B | A3 | I | HDMI side input for the hot plug detect. This pin is unidirectional and is referenced to 5VOUT |
LS_OE | B3 | C | Level shifter enable. This pin is referenced to VCCA. Enables level shifters and LDO when EN is HIGH and LS_OE is HIGH |
PGND | D1 | G | DC-DC converter ground. These pins are isolated from the GND pins. This pin should be tied to system GND |
SCL_A, SDA_A | D4, C4 | I/O | LS system side input and output for I2C Bus. These pins are bidirectional and referenced to VCCA |
SCL_B, SDA_B | A1, B2 | I/O | LS HDMI side connector side input and output for I2C Bus. These pins are bidirectional and referenced to 5VOUT |
SW | C2 | I | Switch input. This pin is the inductor input for the DC-DC converter |
VBAT | D2 | P | Battery supply. This voltage is typically 2.3 V to 5.5 V |
VCCA | A4 | P | System side supply. This voltage is typically 1.2 V to 3.3 V from the core microcontroller |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Supply voltage | VCCA | 4 | V | |
VBAT | –0.3 | 6 | V | |
Input voltage, VI(2) | SCL_A, SDA_A, CEC_A | –0.3 | 4 | V |
SCL_B, SDA_B, CEC_B, HPD_B | –0.3 | 6 | ||
EN, LS_OE | –0.3 | 4 | ||
Voltage applied to any output in the high-impedance or power‑off state, VO(2) | SCL_A, SDA_A, CEC_A | –0.3 | 4 | V |
SCL_B, SDA_B, CEC_B | –0.3 | 6 | ||
Voltage applied to any output in the high or low state, VO(2) | SCL_A, SDA_A, CEC_A | –0.3 | VCCA + 0.3 | V |
SCL_B, SDA_B, CEC_B | –0.3 | 5VOUT + 0.3 | ||
Input clamp current (IV < 0) | –50 | mA | ||
Output clamp current (VO < 0) | –50 | mA | ||
Continuous current through 5VOUT, or GND | ±100 | mA | ||
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | ||||
---|---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | All pins except pins 4A, B3, C3, C4, D3, and D4 | 500 | V |
Pins 4A, B3, C3, C4, D3, and D4 | 2000 | ||||
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | 1000 | ||||
IEC 61000-4-2 Contact Discharge | Pins A1, A3, B1, B2, and C1 | ±14000 | |||
IEC 61000-4-2 Air-gap Discharge | Pins A1, A3, B1, B2, and C1 | ±16000 |
MIN | NOM | MAX | UNIT | ||||
---|---|---|---|---|---|---|---|
VCCA | Supply voltage, VCCA | 1.2 | 3.6 | V | |||
VBAT | Supply voltage, VBAT | 2.3 | 5.5 | V | |||
VIH | High-level input voltage | VCCA = 1.2 V to 3.6 V | SCL_A, SDA_A | 0.7 × VCCA | VCCA | V | |
CEC_A | 0.7 × VCCA | VCCA | |||||
EN, LS_OE | 1 | VCCA | |||||
5VOUT = 5 V | SCL_B, SDA_B | 0.7 × 5VOUT | 5VOUT | ||||
CEC_B | 0.7 × 3.3 V (internal)(1) | 3.3 V (internal)(1) | |||||
HPD_B | 2 | ||||||
VIL | Low-Level input voltage | VCCA = 1.2 V to 3.6 V | SCL_A, SDA_A | –0.5 | 0.082 × VCCA | V | |
CEC_A | –0.5 | 0.082 × VCCA | |||||
EN, LS_OE | –0.5 | 0.4 | |||||
5VOUT = 5 V | SCL_B, SDA_B | –0.5 | 0.3 × 5VOUT | ||||
CEC_B | –0.5 | 0.3 × 3.3 (internal)(1) | |||||
HPD_B | 0 | 0.8 | |||||
VILC | Low-level input voltage | –0.5 | 0.065 × VCCA | V | |||
VOL – VILC | Delta between VOL and VILC (VIO = 2.5 V) | 0.1 × VCCA | V | ||||
TA | Operating free-air temperature | –40 | 85 | °C |
THERMAL METRIC(1) | TPD5S115 | UNIT | |
---|---|---|---|
YFF (DSBGA) | |||
16 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 78.2 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 0.6 | °C/W |
RθJB | Junction-to-board thermal resistance | 13.2 | °C/W |
ψJT | Junction-to-top characterization parameter | 2.5 | °C/W |
ψJB | Junction-to-board characterization parameter | 13 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
VOHA | IOH = –10 µA, VI = VIH, VCCA = 1.2 V to 3.6 V | VCCA × 0.8 | V | ||||
VOLA | IOL = 10 µA, VI = VIL, VCCA = 1.2 V to 3.6 V | VCCA × 0.16 | V | ||||
VOHB | IOH = –10 µA, VI = VIH | V | |||||
VOLB | IOL = 3 mA, VI = VIL | 0.4 | V | ||||
RPU | Internal pullup | SCL_A, SDA_A | Pullup connected to VCCA rail | 10 | kΩ | ||
SCL_B, SDA_B | Pullup connected to 5-V rail | 1.75 | |||||
IPULLUPAC | Transient boosted pullup current (rise-time accelerator) |
SCL_B, SDA_B | Pullup connected to 5-V rail | 15 | mA | ||
IOFF | Leakage current | A port | VCCA = 0 V, VI or VO = 0 to 3.6 V, VCCA = 0 V | ±5 | µA | ||
B port | 5VOUT = 0 V, VI or VO = 0 to 5.5 V, VCCA = 0 V to 3.6 V | ±5 | |||||
IOZ | A port | VO = VCCO or GND, VCCA = 1.2 V to 3.6 V | ±5 | ||||
B port | VI = VCCI or GND, VCCA = 1.2 V to 3.6 V | ±5 | |||||
CL | Bus load capacitance | A port | 15 | pF | |||
B port | 750 | ||||||
SUPPLY CURRENT | |||||||
ICCA | VCCA supply current | Standby | I/Os = HIGH | 2 | µA | ||
Active | I/Os = HIGH | 15 | µA | ||||
ICCB | VBAT supply current | Standby | EN = LOW, LS_OE = LOW | 0.5 | µA | ||
DC-DC and HPD active |
EN = HIGH, LS_OE = LOW | 30 | 50 | µA | |||
DC-DC, HPD, DDC, CEC Active | EN = HIGH, LS_OE = LOW, I/Os = HIGH | 225 | 300 | µA | |||
DC-DC CONVERTER | |||||||
VBAT | Input voltage | 2.3 | 5.5 | V | |||
VOUT | Total DC output voltage(1) | 4.9 | 5 | 5.13 | V | ||
TOVA | Total output voltage accuracy(2) | 4.8 | 5 | 5.3 | V | ||
VIO_Ripple | Output voltage ripple, loaded | IO = 65 mA | 50.6 | mVPP | |||
IO = 150 mA | 16 | ||||||
fCLK | Internal operating frequency | VBAT = 2.3 V to 5.5 V | 3.5 | MHz | |||
tSTART | Start-up time | From EN input to 5-V power output 90% point | 187 | µs | |||
IO | Output current | VBAT = 2.3 V to 5.5 V | 55 | mA | |||
Reverse leakage current, VO | EN = LOW, VO = 5.5 V | 2.5 | µA | ||||
Leakage current from battery to VO | EN = LOW | 5 | µA | ||||
VBATUV | Undervoltage lockout threshold | Falling | 2 | V | |||
Rising | 2.1 | V | |||||
Line transient response | VBAT = 3.4 V, IO = 20 mA to 65 mA, A 217 Hz, 600 mVPP square wave pulse |
17.1 | mVpk | ||||
Load transient response | VBAT = 3.4 V, IO = 5 mA to 65 mA, 10-µs pulse, tRISE = tFALL = 0.1 µs |
63.5 | mVpk | ||||
IINRUSH | Inrush current, average over tSTART | VBAT = 2.3 V to 5.5 V, IOUT = 65 mA | 168 | mA | |||
ISC | Short-circuit current limit from output | 90 | mA | ||||
VOLTAGE LEVEL SHIFTER CEC LINE (x_A & x_B PORTS) | |||||||
VOHA | IOH = –10 µA, VI = VIH, VCCA = 1.2 V to 3.6 V | VCCA × 0.8 | V | ||||
VOLA | IOL = 10 µA, VI = VIL, VCCA = 1.2 V to 3.6 V | VCCA × 0.16 | V | ||||
VOHB | IOH = –20 µA, VI = VIH | VCCA × 0.8 | V | ||||
VOLB | IOL = 3 mA, VI = VIL | 0.4 | V | ||||
RPU | Internal pullup | CEC_A | Pullup connected to VCCA rail | 10 | kΩ | ||
CEC_B | Pullup connected to 3.3 V rail | 22 | 26 | 30 | |||
RPD | Internal pulldown | CEC_B | Pullup connected to GND | 14 | MΩ | ||
IOFF | A port | VCCA = 0 V, VI or VO = 0 to 3.6 V, VCCA = 0 V | ±5 | µA | |||
B port | 5VOUT = 0 V, VI or VO = 0 to 5.5 V, VCCA = 0 V to 3.6 V | ±1.8 | |||||
IOZ | A port | VO = VCCO or GND, VCCA = 1.2 V to 3.6 V | ±5 | ||||
B port | VI = VCCI or GND, VCCA = 1.2 V to 3.6 V | ±5 | |||||
VOLTAGE LEVEL SHIFTER - HPD LINE (X_A & x_B) | |||||||
VOHA | IOH = –3 mA, VI = VIH, VCCA = 1.2 V to 3.6 V | VCCA × 0.7 | V | ||||
VOLA | IOL = 3 mA, VI = VIL, VCCA = 1.2 V to 3.6 V | 0.4 | V | ||||
RPD | Internal pulldown | HPD_B | Pullup connected to GND | 100 | kΩ | ||
IOZ | A port | VI = VCCI or GND, VCCA = 3.6 V | ±5 | µA | |||
LS_OE, EN | |||||||
II | VI = VCCA or GND, VCCA = 1.2 V to 3.6 V | ±12 |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
Capacitance | EN, LS_OE | VBIAS = 1.8 V, f = 1 MHz, 30-mVPP AC signal |
VCCA = 3.6 V, VBAT = 5 V | 7.1 | 9.5 | pF | |
SCL_A, SDA_A, CEC_A | VCCA = 3.6 V, VBAT = 5 V, EN = LOW | 7 | pF | ||||
HPD_A, HPD_B | VCCA = 3.6 V, VBAT = 5 V, EN = LOW | 4 | pF | ||||
SCL_B, SDA_B | VBIAS = 2.5 V, f = 100 kHz, 3.5-VPP AC signal |
VCCA = 3.6 V, VBAT = 5 V, EN = LOW, LS_OE = HIGH | 10 | pF | |||
CEC_B | VBIAS = 1.65 V, f = 100 kHz, 2.5-VPP AC signal |
VCCA = 3.6 V, VBAT = 5 V, EN = LOW, LS_OE = HIGH | 7 | pF | |||
CEC_B | VCCA = 0 V, 5V_IN = 0 V | 7 | pF |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
SCL and SDA LINES (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | DDC channels enabled | 394 | ns | ||
B to A | DDC channels enabled | 347 | |||||
tPLH | Low-to-high propagation delay | A to B | DDC channels enabled | 504 | ns | ||
B to A | DDC channels enabled | 171 | |||||
tFALL | Fall time | A port | DDC channels enabled | 146 | ns | ||
B port | DCC channels enabled | 135 | |||||
tRISE | Rise time | A port | DCC channels enabled | 190 | ns | ||
B port | DCC channels enabled | 93 | |||||
fMAX | Maximum switching frequency | DCC channels enabled | 400 | kHz | |||
CEC LINE (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | CEC channels enabled | 550 | ns | ||
B to A | CEC channels enabled | 350 | |||||
tPLH | Low-to-high propagation delay | A to B | CEC channels enabled | 13 | µs | ||
B to A | CEC channels enabled | 290 | ns | ||||
tFALL | Fall time | A port | CEC channels enabled | 146 | ns | ||
B port | CEC channels enabled | 200 | |||||
tRISE | Rise time | A port | CEC channels enabled | 190 | ns | ||
B port | CEC channels enabled | 16.4 | µs | ||||
HPD LINE (x_A & x_B PORTS) | |||||||
tPHL | Propagation delay | B to A | CEC channels enabled | 10.4 | ns | ||
tPLH | Low-to-high propagation delay | B to A | CEC channels enabled | 9.9 | ns | ||
tFALL | Fall time | A port | CEC channels enabled | 0.7 | ns | ||
tRISE | Rise time | A port | CEC channels enabled | 0.8 | ns |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
SCL, SDA LINES (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | DDC channels enabled | 375 | ns | ||
B to A | DDC channels enabled | 272 | |||||
tPLH | Low-to-high propagation delay | A to B | DDC channels enabled | 488 | ns | ||
B to A | DDC channels enabled | 166 | |||||
tFALL | Fall time | A port | DDC channels enabled | 114 | ns | ||
B port | DCC channels enabled | 135 | |||||
tRISE | Rise time | A port | DCC channels enabled | 186 | ns | ||
B port | DCC channels enabled | 93 | |||||
fMAX | Maximum switching frequency | DCC channels enabled | 400 | kHz | |||
CEC Line (x_A & x_B Ports) | |||||||
tPHL | High-to-low propagation delay | A to B | CEC channels enabled | 536 | ns | ||
B to A | CEC channels enabled | 272 | |||||
tPLH | Low-to-high propagation delay | A to B | CEC channels enabled | 13 | µs | ||
B to A | CEC channels enabled | 285 | ns | ||||
tFALL | Fall time | A port | CEC channels enabled | 113 | ns | ||
B port | CEC channels enabled | 201 | |||||
tRISE | Rise time | A port | CEC channels enabled | 187 | ns | ||
B port | CEC channels enabled | 16 | µs | ||||
HPD LINE (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | B to A | CEC channels enabled | 10 | ns | ||
tPLH | Low-to-high propagation delay | B to A | CEC channels enabled | 10 | ns | ||
tFALL | Fall time | A port | CEC channels enabled | 0.46 | ns | ||
tRISE | Rise time | A port | CEC channels enabled | 0.5 | ns |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
SCL, SDA LINES (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | DDC channels enabled | 370 | ns | ||
B to A | DDC channels enabled | 230 | |||||
tPLH | Low-to-high propagation delay | A to B | DDC channels enabled | 480 | ns | ||
B to A | DDC channels enabled | 163 | |||||
tFALL | Fall time | A port | DDC channels enabled | 100 | ns | ||
B port | DCC channels enabled | 135 | |||||
tRISE | Rise time | A port | DCC channels enabled | 180 | ns | ||
B port | DCC channels enabled | 93 | |||||
fMAX | Maximum switching frequency | DCC channels enabled | 400 | kHz | |||
CEC LINE (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | CEC channels enabled | 530 | ns | ||
B to A | CEC channels enabled | 230 | |||||
tPLH | Low-to-high propagation delay | A to B | CEC channels enabled | 13 | µs | ||
B to A | CEC channels enabled | 280 | ns | ||||
tFALL | Fall time | A port | CEC channels enabled | 98 | ns | ||
B port | CEC channels enabled | 200 | |||||
tRISE | Rise time | A port | CEC channels enabled | 180 | ns | ||
B port | CEC channels enabled | 16 | µs | ||||
HPD LINE (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | B to A | CEC channels enabled | 10 | ns | ||
tPLH | Low-to-high propagation delay | B to A | CEC channels enabled | 10 | ns | ||
tFALL | Fall time | A port | CEC channels enabled | 0.41 | ns | ||
tRISE | Rise time | A port | CEC channels enabled | 0.41 | ns |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
SCL, SDA LINES (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | DDC channels enabled | 370 | ns | ||
B to A | DDC channels enabled | 185 | |||||
tPLH | Low-to-high propagation delay | A to B | DDC channels enabled | 467 | ns | ||
B to A | DDC channels enabled | 160 | |||||
tFALL | Fall time | A port | DDC channels enabled | 80 | ns | ||
B port | DCC channels enabled | 135 | |||||
tRISE | Rise time | A port | DCC channels enabled | 179 | ns | ||
B port | DCC channels enabled | 93 | |||||
fMAX | Maximum switching frequency | DCC channels enabled | 400 | kHz | |||
CEC LINE (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | CEC channels enabled | 530 | ns | ||
B to A | CEC channels enabled | 185 | |||||
tPLH | Low-to-high propagation delay | A to B | CEC channels enabled | 13 | µs | ||
B to A | CEC channels enabled | 275 | ns | ||||
tFALL | Fall time | A port | CEC channels enabled | 80 | ns | ||
B port | CEC channels enabled | 200 | |||||
tRISE | Rise time | A port | CEC channels enabled | 180 | ns | ||
B port | CEC channels enabled | 16 | µs | ||||
HPD LINE (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | B to A | CEC channels enabled | 10 | ns | ||
tPLH | Low-to-high propagation delay | B to A | CEC channels enabled | 10 | ns | ||
tFALL | Fall time | A port | CEC channels enabled | 0.35 | ns | ||
tRISE | Rise time | A port | CEC channels enabled | 0.35 | ns |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|---|---|
SCL, SDA LINES (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | DDC channels enabled | 370 | ns | ||
B to A | DDC channels enabled | 160 | |||||
tPLH | Low-to-high propagation delay | A to B | DDC channels enabled | 460 | ns | ||
B to A | DDC channels enabled | 155 | |||||
tFALL | Fall time | A port | DDC channels enabled | 75 | ns | ||
B port | DCC channels enabled | 135 | |||||
tRISE | Rise time | A port | DCC channels enabled | 180 | ns | ||
B port | DCC channels enabled | 93 | |||||
fMAX | Maximum switching frequency | DCC channels enabled | 400 | kHz | |||
CEC LINE (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | A to B | CEC channels enabled | 530 | ns | ||
B to A | CEC channels enabled | 160 | |||||
tPLH | Low-to-high propagation delay | A to B | CEC channels enabled | 13 | µs | ||
B to A | CEC channels enabled | 275 | ns | ||||
tFALL | Fall time | A port | CEC channels enabled | 73 | ns | ||
B port | CEC channels enabled | 200 | |||||
tRISE | Rise time | A port | CEC channels enabled | 180 | ns | ||
B port | CEC channels enabled | 16 | µs | ||||
HPD LINE (x_A & x_B PORTS) | |||||||
tPHL | High-to-low propagation delay | B to A | CEC channels enabled | 10 | ns | ||
tPLH | Low-to-high propagation delay | B to A | CEC channels enabled | 10 | ns | ||
tFALL | Fall time | A port | CEC channels enabled | 0.34 | ns | ||
tRISE | Rise time | A port | CEC channels enabled | 0.36 | ns |
The TPD5S115 is an integrated interface solution that covers HDMI versions' 2.0, 1.4, and 1.3 need for power supply voltage management and control line level translation. On the power supply line, it has a DC-DC converter that takes the internal power supply from 2.3 V to 5.5 V, and outputs a regulated and current-limited, 5‑V voltage to the connector. The drivers support level translation on HPD, ECE, SCL, and SDA lines in both transmission directions. Moreover, the rise-time acceleration feature helps drive the high capacitive load on the cable side. Every channel comes with robust ESD protection with ±14-kV contact and ±16-kV air-gap IEC61000‑4-2 capability.
The HDMI cable side of the DDC lines incorporates rise-time accelerators to support the high capacitive load on the HDMI cable side. The rise-time accelerator boosts the cable-side DDC signal, independent of which side of the bus is releasing the signal.
After the TPD5S115’s DC-DC converter and HPD block are enabled through the EN pin, the TPD5S115 is ready for continual HDMI receiver detection. After a HDMI cable connects a receiving and transmitting device together, the 5-V signal from the DC-DC output flows through the receiving device’s internal resistor and into HPD’s input. The HPD buffer’s output then goes high, indicating to the transmitter that a receiving device is connected. To save power, periodic detection can be done by turning on and off the DC-DC converter before a receiving device is connected.
NOTE
Ground offset between the TPD5S115 ground and the ground of devices on port A of the TPD5S115 must be avoided. A CMOS or NMOS open-drain capable of sinking 3 mA of current at 0.4 V has an output resistance of 133 Ω or less (R = E / I). Such a driver shares enough current with the port A output pulldown of the TPD5S115 to be detected as a LOW while the ground offset is zero. If the ground offset is greater than 0 V, then the driver resistance must be less. Because VILC can be as low as 90 mV at cold temperatures and the low end of the current distribution, the maximum ground offset should not exceed 50 mV. Bus repeaters that use an output offset are not interoperable with the port A of the TPD5S115 as their output LOW levels are not recognized by the TPD5S115 as a LOW. If the TPD5S115 is placed in an application where the VIL of port A of the TPD5S115 does not go below its VILC it will pull port B LOW initially when port A input transitions LOW but the port B will return HIGH, so it does not reproduce the port A input on port B. Such applications must be avoided. Port B is interoperable with all I2C-bus slaves, masters, and repeaters.
The CEC level shift function operates in the same manner as the DDC lines except that the CEC line does not need the rise time accelerator function.
The system is designed to work properly with no external pullup resistors on the DDC, CEC, and HPD lines.
The undervoltage-lockout circuit prevents the DC-DC converter from malfunctioning at low input voltages and from excessive discharge of the battery. It disables the output stage of the converter once the falling VIN trips the undervoltage-lockout threshold (VBATUV). The undervoltage-lockout threshold for falling VIN is typically 2 V. The device starts operation once the rising VIN trips the under-voltage-lockout threshold again at 2.1 V (typical).
The DC-DC converter has an internal soft-start circuit that controls the ramp-up of the output voltage. The output voltage reaches its nominal value within 250 µs (typical) after EN has been pulled high. The output voltage ramps up from 5% to its nominal value within 300 µs (typical). This limits the in-rush current in the converter during start-up and prevents possible input voltage drops when a battery or high impedance power source is used. During soft start, the switch current limit is reduced to 300 mA until the output voltage reaches VIN. Once the output voltage trips this threshold, the device operates with its nominal current limit.
The TPD5S115 integrates a power-save mode to improve efficiency at light loads. In power-save mode, the converter only operates when the output voltage trips below a set threshold voltage. It ramps up the output voltage with several pulses and goes into power-save mode once the output voltage exceeds the set threshold voltage. The PFM mode is ended and PWM mode begins in case the output current can no longer be supported in PFM mode.
The DC-DC converter is enabled when the EN is set to high. At first, the internal reference is activated and the internal analog circuits are settled. Afterwards, the soft start is activated and the output voltage is ramped up. The output voltage reaches its nominal value in 250 µs (typical) after the device has been enabled. The EN input can be used to control power sequencing in a system with various DC-DC converters. The EN pin can be connected to the output of another converter to drive the EN pin high and create a sequencing of supply rails. When EN = GND, the converter enters shutdown mode.