Differences

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--- pmic [2025/01/12 16:57] – arisotura
+++ pmic [2025/04/03 20:30] (current) – arisotura
@@ Line 19: / Line 19: @@
 | 9   | ?? |
 | 10  | 4.75V input from AC adapter |
-| 11  | ?? |
+| 11  | Battery pin 2 (gray) (through 510ohm resistor) |
 | 12  | ?? |
 | 13  | ?? |
@@ Line 25: / Line 25: @@
 | 15  | ?? |
 | 16  | ?? |
-| 17  | ?? |
+| 17  | Ground |
 | 18  | ?? |
-| 19  | ?? |
+| 19  | Vcc1 - 3.2V (UIC voltage?) |
-| 20  | ?? |
+| 20  | Vcc1 feedback |
 | 21  | ?? |
-| 22  | ?? |
+| 22  | Vcc2 feedback |
-| 23  | ?? |
+| 23  | Vcc2 - 1.24V (SoC core voltage) |
-| 24  | ?? |
+| 24  | Power button output - to UIC pin 64 |
-| 25  | ?? |
+| 25  | Power button |
-| 26  | ?? |
+| 26  | CPU/etc active - to UIC pin 19 |
-| 27  | ?? |
+| 27  | UIC I2C - SDA |
-| 28  | ?? |
+| 28  | UIC I2C - SCL |
-| 29  | ?? |
+| 29  | Vcc3 - 2.8V output for peripherals (CPU, Flash, etc) |
-| 30  | ?? |
+| 30  | Ground |
-| 31  | ?? |
+| 31  | Vcc3 feedback |
 | 32  | ?? |
 | 33  | ?? |
@@ Line 48: / Line 48: @@
 | 38  | ?? |
 | 39  | ?? |
-| 40  | ?? |
+| 40  | System active? - to UIC pin 17, with 100k pull-up resistor |
 | 41  | ?? |
-| 42  | ?? |
+| 42  | Ground |
 | 43  | Battery pin 4 (white) |
 | 44  | ?? |
@@ Line 83: / Line 83: @@
 Which battery level is read out of registers 0x09/0x0A seems to depend on settings in register 0x07.
+Writes to register 0x07 (and 0x08):
+06 - to turn on the CPU
+D9 - to read current battery level
+D0 - to read maximum battery level
+D5 - ?? to read minimum battery level?? (unused)
+07 - to turn off the CPU
+Seems register 0x0D is set to 0xA0 after turning the CPU on/off?
+Bit 5 in register 0x07 is some sort of ready bit that is checked after changing register 0x07 and before reading battery levels.