MAX1669 Datasheet, PDF (11/20 Pages) Maxim Integrated Products – Fan Controller and Remote Temperature Sensor with SMBus Serial Interface

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