Intermec 073292-001 User Manual

Where 

[ack]

 

= ACK

 

from PXA255, 

[nak]

 

= NAK

 

from PXA255 

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] 

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.