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Chapter 4 — Theory of Operation 
Where 
[ack]
 
= ACK
 
from PXA255, 
[nak]
 
= NAK
 
from PXA255 
Hex 
Command 
Return Data 
0x10 SetLowBatLED 
0x10 
0x11 
ClearLowBatLED 
0x11 
0x12 
PSCSoftwareVer 
0x12 + PSC firmware version byte 
0x30 
ReadMainBatVoltage 
0x30 + main battery voltage byte 
0x40 
ReadSuperCapVoltage 
0x40 + supercap voltage byte 
0x50 
ReadTemperature 
0x50 + temperature byte 
0x5A PSCTest 
0x5A 
0x60 
ColdBoot 
0x60 
0x61 WarmBoot 
0x61 
0x70 
SuperCapChargeEnable 
0x70 
0x71 SuperCapChargeDisable 0x71 
0x80 
StartLowBatLEDFlash 
0x80 
0x81 StopLowBatLEDFlash  0x81 
 
 
 
Several commands can be issued in a single burst before the host I2C 
driver attempts to read return values back from the PSC.   
Examples:  
([W] = Write, [R] = Read, [A] = Ack, [N] = Nak)
 
A typical battery/supercap/temperature status request: 
[Start]#12[W][A]30[A]40[A]50[A][Start]#12[R][A]30[A]95[A]
40[A]E1[A]50[A]56[N][Stop] 
A warm boot command followed by a battery/supercap/temperature status 
request: 
[Start]#12[W][A]61[A][Start]#12[W][A]30[A]40[A]50[A] 
[Start]#12[R][A]61[A]30[A]97[A]40[A]E0[A]50[N][Stop] 
Battery Status Monitoring 
Main battery voltage under load is scaled through operational amplifiers 
U41, sampled through the PSC A/D converter, and made available to 
system power management software for accurate on-display fuel gauging 
and device power management in the low-battery operating region.  
Reference D14 and operational amplifiers U41 provide the reference 
voltage for the PIC A/D. The PSC sends raw A/D data over the I2C bus 
in response to I2C commands sent approximately every 3 seconds from the 
power management software running on the PXA255 (See “PSC 12C 
Syntax” on page 59). 
CK30 internal temperature is sensed by thermistor RT3, read through a 
PSC A/D, and sent to the OS over the I2C bus in response to I2C 
command. 
60 
CK30 Handheld Computer Service Manual