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The Texas Instruments SN99057RSBR is a power management IC used by the PS 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 PS Vita is powered off and connected to a PC, this chip is likely what the USB sees. Texas Instruments has stated that “the SN99057RSBR part was a custom device manufactured for a specific company.”

The device is now obsolete nor do we have access to the datasheet.

The current hypothesis is that this IC is responsible of 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 (G8)
39	I2C	SDA
40	I2C	SCL