Rainbow Electronics MAX1669 - Manual (Page 11)

MAX1669
Fan Controller and Remote Temperature Sensor
with SMBus Serial Interface
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REGISTER COMMAND FUNCTION
00h Reserved for future use N/A
RTEMP 01h Read latest temperature N/A
RSTAT 02h Read status byte (temp flags, I/O_ states) N/A
RCFG 03h Read configuration byte 0000 0010b
04h Reserved for future use N/A
05h Reserved for future use N/A
06h Reserved for future use N/A
RHI 07h Read T HIGH limit 0111 1111b
RLOW 08h Read T
LOW
limit 1100 1001b
WCFG 09h Write configuration byte N/A
0Ah Reserved for future use N/A
0Bh Reserved for future use N/A
0Ch Reserved for future use N/A
WHI 0Dh Write T HIGH limit N/A
WLOW 0Eh Write T LOW limit N/A
OSHT 0Fh
One-shot command. Will execute a single conversion even if the
device is in software standby.
N/A
RCRIT 10h Read T CRIT limit 0110 0100b
RPROT 11h Read write-once protection byte 0000 0000b
RFREQ 12h Read PWM frequency 0000 0000b
RDUTY 13h Read FAN duty factor 0000 0000b
RGPIO 14h Read GPIO data 1100 0000b
15h Reserved for future use N/A
16h Reserved for future use N/A
17h Reserved for future use N/A
WCRIT
POR STATE
18h Write T CRIT limit N/A
WPROT 19h Write write-once protection byte N/A
WFREQ 1Ah Write PWM frequency N/A
WDUTY 1Bh Write FAN duty factor N/A
WGPIO 1Ch Write GPIO data N/A
RFU 1Dh-FDh Reserved for future use N/A
MFG ID FEh Manufacturing ID code = 4Dh, ASCII code for “M” (for Maxim)
Least Sig Byte
0100 1101b
DEV ID FFh Device ID code, specific to MAX1669
Least Sig Byte
0000 0101b
Table 3. Command Byte Bit Assignments
ID Codes