SN99057

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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