SLLA649 August 2024 TUSB1021-Q1 , TUSB521-Q1
| Pin Name | Pin Number(s) | Pin Description | Recommendation |
|---|---|---|---|
| Power Pins | |||
| VCC | 12, 20, 38 | 3.3 V Positive Power Supply | Parallel array of one 10 µF and three 0.1µF capacitors to GND. |
| GND | PAD | Ground | Connected to Ground. |
| Configuration Pins | |||
| EQ0 | 3 | This pin along with EQ1 sets the USB receiver equalizer gain for RX1 and RX2. If not used, this pin can be left unconnected. | Pull down to GND with a 20kΩ pull-down resistor in combination with EQ1 settings to set RX1 and RX2 ports to EQ setting #1. Refer to Table 7-3 in the data sheet for additional configurations. To avoid over equalizing data start at the lowest settings and increase until described eye is achieved. |
| EQ1 | 6 | This pin along with EQ0 sets the USB receiver equalizer gain for RX1 and RX2. If not used, this pin can be left unconnected. | Pull down to GND with a 1kΩ pull-down resistor in combination with EQ0 settings to set RX1 and RX2 ports to EQ setting #1 . Refer to Table 7-3 in the data sheet for additional configurations. To avoid over equalizing data start at the lowest settings and increase until the desired eye is achieved. |
| SSEQ0/A0 | 30 | Along with SSEQ1, sets the USB receiver equalizer gain for SSTXP/N receiver. When I2C_EN ≠ '0', this pin also sets the I2C address. If I2C_EN = “F”, then this pin must be set to “F” or “0”. | Pull down to GND with a 20kΩ pull-down resistor in combination with SSEQ1 settings to set the SSTX port to EQ setting #1. Refer to Table 7-3 in the data sheet for additional configurations. To avoid over equalizing data start at the lowest settings and increase until described eye is achieved. |
| SSEQ1 | 35 | Along with SSEQ0, sets the USB receiver equalizer gain for SSTXP/N receiver. | Pull down to GND with a 1kΩ pull-down resistor in combination with SSEQ1 settings to set the SSTX port to EQ setting #1. Refer to Table 7-3 in the data sheet for additional configurations. To avoid over equalizing data start at the lowest settings and increase until described eye is achieved. |
| A1 | 27 | When I2C_EN ≠ '0', this pin also sets the TUSB521-Q1 I2C address. | Can be connected to GND using a 1kΩ pull-down resistor. Table 7-5 can be used to determine a different address if one is needed. |
| FLIP/SCL | 13 | When I2C_EN = ’0’, this is Flip control pin, When I2C_EN != "0", this pin is I2C clock. When used for I2C clock, pullup to I2C controller's VCC I2C supply. | If I2C_EN = 0, then this pin should be connected to a PD/CC controller, to help determine what is the orientation of the USB-C connection. If I2C_EN != 0, this should be connected to the SCL pin of an I2C configuration, with a pullup to the VCC of the I2C controller's supply. |
| CTL0/SDA | 14 | When I2C_EN = '0', this is a USB3.2 control pin, When I2C_EN != "0", this pin is I2C data. When used for I2C clock, pullup to I2C controller's VCC I2C supply. | If I2C_EN = 0, then this pin should be connected to pulled up to high to enable USB, or driven externally to enable when needed.. If I2C_EN != 0, this should be connected to the SDA pin of an I2C configuration, with a pullup to the VCC of the I2C controller's supply. |
| I2C_EN | 9 | I2C Programming Mode or GPIO Programming Select. I2C is only disabled when this pin is ‘0'. | If I2C is not being used, this pin can be connected to GND using a 1kΩ pull-down resistor. If I2C is being used, this pin should be left floating or pulled up to VCC with a 1kΩ pull-up resistor to enable I2C at 1.8V or 3.3V. |
| EN | 21 | Device Enable. For normal operation, pull this pin up to 3.3V through a 10k to 50kΩ resistor. | To enable this device, this pin should be pulled up to 3.3V with a 10k to 50kΩ pull-up resistor. |
| USB Data Lines | |||
| TX1P | 1 | Differential positive output. Connect to the Type-C receptacle's TX1p pin through an external ac-coupling capacitor. | Connect to the USB3.2 TX1/2 P/N terminals of a USB Type-C receptacle with 220nF AC coupling capacitors, and a 1-2Ω resistor for ESD protection. These pins allow polarity swapping. |
| TX1N | 2 | Differential negative output. Connect to the Type-C receptacle's TX1n pin through an external ac-coupling capacitor | |
| TX2P | 11 | Differential positive output. Connect to the Type-C receptacle's TX2p pin through an external ac-coupling capacitor. | |
| TX2N | 10 | Differential negative output. Connect to the Type-C receptacle's TX2n pin through an external ac-coupling capacitor | |
| RX1P | 4 | Differential positive input. Connect to the Type-C receptacle's RX1p pin through an external ac-coupling capacitor. | Connect to the USB3.2 RX1/2 P/N terminals of a USB Type-C receptacle with 330nF AC coupling capacitors, and a 1-2Ω resistor for ESD protection. These pins allow polarity swapping. |
| RX1N | 5 | Differential negative input. Connect to the Type-C receptacle's RX1n pin through an external ac-coupling capacitor | |
| RX2P | 8 | Differential positive input. Connect to the Type-C receptacle's RX2p pin through an external ac-coupling capacitor. | |
| RX2N | 7 | Differential negative input. Connect to the Type-C receptacle's RX2p pin through an external ac-coupling capacitor. | |
| SSTXp | 40 | Differential positive input. Connect to the USB3.2 Host/Device transmitter through an external ac-coupling capacitor. | Connect to the USB3.2 RX1/2 P/N terminals of a USB Type-C receptacle with 330nF AC coupling capacitors, and a 1-2Ω resistor for ESD protection. These pins allow polarity swapping. |
| SSTXn | 39 | Differential negative input. Connect to the USB3.2 Host/Device transmitter through an external ac-coupling capacitor. | |
| SSRXp | 37 | Differential positive output. Connect to the USB3.2 Host/Device receiver through an external ac-coupling capacitor. | Connect to the USB3.2 TX1/2 P/N terminals of a USB Type-C receptacle with 220nF AC coupling capacitors, and a 1-2Ω resistor for ESD protection. These pins allow polarity swapping. |
| SSRXn | 36 | Differential negative output. Connect to the USB3.2 Host/Device receiver through an external ac-coupling capacitor. | |
| Misc. Pins | |||
| RSVD | 32, 31, 29, 28, 26, 25, 23, 22, 16, 17, 18, 19 | Reserved. Leave unconnected | Leave unconnected/floating. |
| NC | 33 | No connect pin. Leave open. | Leave unconnected/floating. |
| TEST1 | 15 | Test. Leave unconnected or pulldown to GND. | Leave floating or pulled down directly to GND. |
| TEST2 | 24 | Test2. Connect directly to GND or pulldown with a 100k or less resistor. | Connect directly to GND. |
| TEST3 | 34 | Test pin. Leave unconnected. | Leave unconnected/floating. |