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The TI SN99057RSBR is a power management IC used by the Vita in conjunction with the bq27520-G1 battery fuel gauge to manage the battery. There is a USB interface that is connected to a switch TS3USB31RSER with the main Kermit USB. When the device is powered off and connected to a PC, this chip is likely what the USB sees.
The current hypothesis is that this IC is responsible to managing battery charging.
Pinout
Pin | Type | Description |
---|---|---|
1 | ? | N/C |
2 | I/O | To bq27520-G1 A2 - SOC_INT, indicates battery charged > threshold |
3 | PWR | |
4 | PWR | |
5 | PWR | |
6 | I/O | To TS3USB31 USB D+ |
7 | I/O | To TS3USB31 USB D- |
8 | I/O | To Kermit GPIO B20 |
9 | I/O | To Kermit GPIO A23 |
10 | I/O | To Kermit GPIO A25 |
11 | ? | To passives |
12 | ? | To capacitor |
13 | PWR | |
14 | PWR | |
15 | PWR | Net 1 (Battery) |
16 | PWR | Net 1 (Battery) |
17 | PWR | Net 1 (Battery) |
18 | PWR | Net 2 |
19 | PWR | Net 2 |
20 | PWR | Net 2 |
21 | PWR | |
22 | ? | N/C |
23 | GND | |
24 | GND | |
25 | PWR | Net 3 |
26 | PWR | Net 3 |
27 | PWR | Net 4 |
28 | PWR | Net 4 |
29 | PWR | Net 4 |
30 | PWR | Net 4 |
31 | PWR | Net 5 |
32 | PWR | Net 5 |
33 | ? | To capacitor |
34 | PWR | Net 6 (USB VBUS) |
35 | PWR | Net 6 (USB VBUS) |
36 | GND | |
37 | I/O | To right daughterboard |
38 | I/O | To syscon |
39 | I2C | SDA |
40 | I2C | SCL |