SLUSAQ4G October 2011 – September 2022 TPS40422
PRODUCTION DATA
The PMBus protocol specification requires that each device connected to the PMBus interface have a unique address on the bus. The TPS4022 device has 64 possible addresses (0 through 63 in decimal) that can be assigned by connecting resistors from the ADDR0 and ADDR1 pins to AGND. The device sets the address in the form of two octal (0-7) digits, one digit for each pin. The ADDR1 pin is the high-order digit and the ADDR0 pin is the low-order digit.
The E48 series resistors suggested for each digit value are shown in Table 8-3.
| DIGIT | RESISTANCE (kΩ) |
|---|---|
| 0 | 11 |
| 1 | 18.7 |
| 2 | 27.4 |
| 3 | 38.3 |
| 4 | 53.6 |
| 5 | 82.5 |
| 6 | 127 |
| 7 | 187 |
The TPS4022 device also detects values that are out of range on the ADDR0 and ADDR1 pins. If either pin is detected as having an out of range resistance connected to it, the device continues to respond to PMBus commands, but at address 127, which is outside of the possible programmed addresses. It is possible but not recommended to use the device in this condition, especially if other TPS4022 devices are present on the bus or if another device could possibly occupy the 127 address.