The TPS65381A-Q1 device is a multirail power supply designed to supply microcontrollers (MCUs) in safety-relevant applications, such as those found in automotive and industrial markets. The device supports Texas Instruments’ Hercules™ TMS570 MCU and C2000™ MCU families, and various other MCUs with dual-core lockstep (LS) or loosely-coupled architectures (LC).
The TPS65381A-Q1 device integrates multiple supply rails to power the MCU, controller area network (CAN), or FlexRay, and an external sensor. An asynchronous-buck switch-mode power-supply converter with an internal FET converts the input supply (battery) voltage to a 6-V preregulator output. This 6-V preregulator supplies the other regulators. The device supports wakeup from IGNITION or wakeup from the CAN transceiver.
The integrated, fixed 5-V linear regulator with internal FET can be used for a CAN or FlexRay transceiver supply for example. A second linear regulator, also with an internal FET, regulates to a selectable 5-V or 3.3-V output which, for example, can be use for the MCU I/O voltage.
The TPS65381A-Q1 device includes an adjustable linear-regulator controller, requiring an external FET and resistor divider, that regulates to an adjustable voltage of between 0.8 V and 3.3 V which may be used for the MCU core supply.
The integrated sensor supply can be run in tracking mode or adjustable output mode and includes short-to-ground and short-to-battery protection. Therefore, this regulator can power a sensor outside the module or electronic control unit (ECU).
The integrated charge pump provides overdrive voltage for the internal regulators. The charge pump can also be used in a reverse-battery protection circuit by using the charge-pump output to control an external NMOS transistor. This solution allows for a lower minimum-battery-voltage operation compared to a traditional reverse-battery blocking diode when the device must be operational at the lowest possible supply voltages.
The device monitors undervoltage and overvoltage on all regulator outputs, battery voltage, and internal supply rails. A second bandgap reference, independent from the main bandgap reference, is used for the undervoltage and overvoltage monitoring, to avoid any drifts in the main bandgap reference from being undetected. In addition, regulator current-limits and temperature protections are implemented.
The TPS65381A-Q1 device has monitoring and protection functions, which include the following: watchdog with trigger and question and answer modes, MCU error-signal monitor, clock monitoring on internal oscillators, self-check on the clock monitor, cyclic redundancy check (CRC) on nonvolatile memory, a diagnostic output pin allowing the MCU to observe internal analog and digital signals of the device, a reset circuit and output pin for the MCU, and an enable drive output to disable the safing-path or external-power stages on detected faults. A built-in self-test (BIST) monitors the device functionality automatically at power-up. A dedicated DIAGNOSTIC state allows the MCU to check TPS65381A-Q1 monitoring and protection functions.
The TPS65381A-Q1 device is offered in a 32-pin HTSSOP PowerPAD package.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS65381A-Q1 | HTSSOP (32) | 11.00 mm × 6.20 mm |
Changes from * Revision (July 2016) to A Revision
The pin configuration drawing in this section is not to scale. For package dimensions, see the mechanical data in Section 10.
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | VBAT_SAFING | PWR | Battery (supply) input for monitoring (VMON) and BG2 functions (must be reverse protected), should be connected to VBATP |
2 | VCP | PWR | Charge-pump output voltage |
3 | CP1 | PWR | Charge-pump external capacitor, high-voltage side |
4 | CP2 | PWR | Charge-pump external capacitor, low-voltage side |
5 | PGND | GND | Ground (power) |
6 | NRES | O | Cold reset output signal for the microcontroller (MCU) (active-low, internal pullup, open drain output) |
7 | DIAG_OUT | O | Diagnostic output pin for diagnostic MUX. Internal analog (AMUX) and digital (DMUX) signal connection to MCU ADC and digital IO |
8 | NCS | I | SPI chip select (active-low, internal pullup) |
9 | SDI | I | SPI serial data IN (internal pulldown) |
10 | SDO | O | SPI serial data OUT |
11 | SCLK | I | SPI clock (internal pull down) |
12 | RSTEXT | I | Configuration pin to set reset extension time through a resistor to GND |
13 | ERROR/WDI | I | Error input signal from the MCU while using the MCU ESM (with the watchdog in Q&A Mode), trigger input for the watchdog in trigger mode (MCU ESM not used). This pin is edge triggered. |
14 | CANWU | I | Wake-up input from CAN transceiver, other transceiver or other source. Wake-up request latched with CANWU_L. (internal pulldown) |
15 | VSFB1 | I | Feedback input reference for sensor supply regulator (VSOUT1) |
16 | VSIN | PWR | Input supply voltage for the sensor-supply regulator (VSOUT1) |
17 | VSOUT1 | PWR | Output voltage for the VSOUT1 sensor-supply regulator |
18 | VTRACK1 | I | Tracking input reference for sensor-supply regulator (VSOUT1) (internal pulldown) |
19 | GND | GND | Ground (analog) |
23 | GND | GND | Ground (analog) |
20 | VDD5 | PWR | VDD5 regulator output voltage |
21 | VDD3/5 | PWR | VDD3/5 regulator output voltage |
22 | VDDIO | PWR | I/O supply input for pins to and from the MCU |
24 | VDD1_SENSE | I | Reference input for VDD1 regulator (feedback) and input for UV/OV monitoring of VDD1 regulator |
25 | PGND | GND | Ground (power) |
26 | VDD1_G | O | Gate drive of external FET for VDD1 regulator |
27 | VDD6 | PWR | VDD6 switch mode regulator feedback input and supply input for integrated VDD5 and VDD3/5 regulators |
28 | SDN6 | PWR | Switching node for VDD6 switch mode regulator |
29 | VBATP | PWR | Battery (supply) voltage (must be reverse protected), main power supply input for device |
30 | IGN | I | Wake-up input from ignition (key) or other source (internal pulldown) |
31 | SEL_VDD3/5 | I | Input selects voltage level for VDD3/5 regulator (SEL_VDD3/5 pin open: 3.3-V regulation from VDD3/5; SEL_VDD3/5 pin to GND: 5-V regulation from VDD3/5) |
32 | ENDRV | O | Enable output signal for peripherals (for example, motor-driver IC), safing path output (internal pullup, open drain output) |
— | Thermal pad | — | Place thermal vias to large ground plane and connect to GND and PGND pins. |