Janz Tec emPC-CX+, System Reference Manual

Page: 33 / 44

emPC-CX+ ( System Reference Manual)

System Control 3 - 31
Rev. 1.2
© Janz Tec AG
0b1000000000000000 Sensor error
FANCON_RDWR Pointer 33 (16bit, wo/ro)
15 7 0
FR FW FS FADDR FDATA
RESET:
FR Write this bit as 1 to trigger register read operation from the fan controller
with the programmed address. This bit clears to zero when the read
operation has been completed. Unless an error is indicated, the data can
then be read from the FDATA field
FW Write this bit as 1 to trigger register write operation to the fan controller
with the programmed address and data. This bit clears to zero when the
write operation has been completed.
FS Status for the last operation: 0 = ok, 1 = fail. Valid when either FR or FW
have cleared to zero after an operation.
FADDR The fan controller register to be read or written.
FDATA For write operations this register field supplies the data to be written. For
read operations the data can be read from this register.
3.1.3 Command Codes
This section lists the command codes that are accepted by the PMON firmware. Undocumented
command codes should not be issued.
CMD
code Command Description
0 IDLE When read, this command code indicates idle state.
1 SAVE_EEP Save al
l parameters that are indicated as “EEPROM saved”
into the PMON MCUs internal EEPROM. This makes
changes permanent.
Before writing, some simple sanity checks are made. E.g.
you cannot save a voltage threshold that is higher than the
supported operating value.
No checks are made on the timing parameters.
2 RESET_ERR Reset the PMON MCU reset information in the STATUS
register.
9 PACADCREAD Read ADC data from the ispPAC chip. The channel is
selected by the DATA register.
Channel Voltage Rail Factor
0 Vin 7.8
1 +12V 3
2 N/A -
3 +5V 1
4 +3.3V 1
5 +1.2V 1
6 +12V (exp.) 3
7 N/A -
8 +1.5V 1
9 N/A -
The returned value is a correct ADC value if bit 0 of the
DATA register is 1.
To convert to a voltage value use the following formula:
Voltage /mV = (( DATA >>4)&0xfff) * 2 * factor
Where factor is taken from the table above.