THMC50 Datasheet, PDF (26/32 Pages) Texas Instruments – REMOTE/LOCAL TEMPERATURE MONITOR AND FAN CONTROLLER WITH SMBus INTERFACE

THMC50
REMOTE/LOCAL TEMPERATURE MONITOR AND
FAN CONTROLLER WITH SMBus INTERFACE
SLIS090 – JULY 1999
PRINCIPLES OF OPERATION
register 0x4C interrupt status register 1 mirror
power-on default <7:0> = 00h
BIT
NAME
READ/WRITE
DESCRIPTION
0 Ambient temperature error Read only
A 1 indicates one of the ambient temperature limits has been exceeded.
1 Reserved
Read only
Undefined (reserved for remote thermal diode 2 temperature error)
2 Reserved
Read only
Undefined (reserved for remote thermal diode 2 fault)
3 Reserved
Read only
Undefined
4 GPI input
Read only
A 1 indicates that the GPI terminal is asserted. The polarity of the GPI terminal is
determined by GPI invert (bit 6) in the configuration register. For example, if GPI invert is
cleared, then this bit is 1 when the GPI terminal is high (1); this bit is 0 when the GPI
terminal is low (0). If GPI invert is set, then this bit is 1 when the GPI terminal is low (0); this
bit is 0 when the GPI terminal is high (1). Note: The state of GPI is not latched; this bit
simply reflects the state or inverted state of the GPI terminal. If this bit is 1, reading this
register does not clear it to 0.
5 Remote temperature error Read only
A 1 indicates one of the remote thermal diode limits has been exceeded.
6 THERM input
Read only
A 1 indicates that the thermal overload (THERM) line has been asserted externally.
7 Remote diode fault
Read only
A 1 indicates either a short or open circuited fault on the remote thermal diode inputs.
register 0x13 - 0x4A value RAM
power-on default are undefined unless stated otherwise
ADDRESS READ/WRITE
DESCRIPTION
0x13
Read/write
Programmable ambient temperature automatic trip point ≥ default 70°C. This register can only be written if the
write-once bit in the configuration register (0x40, bit 3) has not been set.
0x14
Read/write
Programmable remote thermal diode automatic trip point ≥ default 100°C. This register can only be written if the
write-once bit in the configuration register (0x40, bit 3) has not been set.
0x15
Read/write
Manufacturer’s test register
0x17
0x18
Read only
Read only
Default ambient temperature automatic trip point ≥ 70° C
Default remote thermal diode automatic trip point ≥ 100°C
0x19
Read/write
Analog output (defaults to 0x00)
0x20
N/A
Reserved (for future second remote thermal diode temperature)
0x26
Read only
Remote thermal diode temperature
0x27
Read only
Ambient temperature
0x2B
N/A
Reserved (for future second remote thermal diode high limit)
0x2C
N/A
Reserved (for future second remote thermal diode low limit)
0x37
Read/write
Remote thermal diode high limit
0x38
Read/write
Remote thermal diode low limit
0x39
Read/write
Ambient temperature high limit
0x3A
Read/write
Ambient temperature low limit
0x3E
Read only
Company ID number (0x49)
0x3F
Read only
Stepping ID number and THMC50 version number
0x44
Read/write
For manufacturer’s test use (reads or writes have unpredictable results)
0x47
Read/write
For manufacturer’s test use (reads or writes have unpredictable results)
0x4A
Read/write
For manufacturer’s test use (reads or writes have unpredictable results)
NOTE: All unspecified locations are considered as reserved and should not be accessed. Unpredictable results may occur.
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