TCM1617 Datasheet, PDF (12/14 Pages) Microchip Technology – SMBus Thermal Sensor with External Diode Input

SMBus Thermal Sensor with External Diode Input
TCM1617
Status Register (Status), 8-Bits, Read Only:
D[7]
Busy
Status Register (Status)
D[6] D[5] D[4] D[3] D[2] D[1] D[0]
Flag1 Flag2 Flag3 Flag4 Flag5 Reserved
Bit POR Function
State
Operation*
D[7] 0
D[6] 0
D[5] 0
D[4] 0
D[3] 0
D[2] 0
D[1:0] 0
Signal A/D
converter is busy.
Interrupt flag for
INT_HLIM event
Interrupt flag for
INT_LLIM event
Interrupt flag for
EXT_HLIM event
Interrupt flag for
EXT_LLIM event
External diode
“fault” flag
Reserved –
Always
returns zero.
1 = A/D busy,
0 = A/D idle
1 = interrupt occurred,
0 = none
1 = interrupt occurred,
0 = none
1 = interrupt occurred,
0 = none
1 = interrupt occurred,
0 = none
1 = external diode fault,
0 = external diode OK
N/A
NOTE: All status bits are cleared after a read operation is performed on
STATUS. The EXT_TEMP register will read +127°C if an external
diode “open” is detected.
Manufacturer’s Identification Register
(MFR_ID), 8-Bits, Read Only:
Manufacturer’s Identification Register (MFR_ID)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB X
X
X
X
X
X
LSB
Manufacturer’s Revision Register
(MFR_REV), 8-Bits, Read Only:
Manufacturer’s Revision Register (MFR_REV)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB X X
XX
X
X
LSB
Register Set Summary:
The TCM1617’s register set is summarized below. All
registers are 8-bits wide.
Name
Description
POR
State
Read Write
INT_TEMP Internal sensor 0000 0000b* 
temperature
(2’s complement)
EXT_TEMP External sensor 0000 0000b* 
temperature
(2’s complement)
STATUS
STATUS register 0000 0000b 
CONFIG
CONFIG register 0000 0000b 

CONV_RATE A/D conversion 0000 0010b 

rate register
INT_HLIM Internal high
0111 1111b 

limit
(2’s complement)
INT_LLIM
Internal low
limit
1100 1001b 

(2’s complement)
EXT_HLIM External high
0111 1111b 

limit
(2’s complement)
EXT_LLIM
External low
limit
1100 1001b 

(2’s complement)
MFR_ID
ASCII for letter “T” 0101 0100b 
(Microchip)
MFR_REV Serial device
revision#
**

NOTE: *The INT_TEMP and EXT_TEMP register immediately will be
updated by the A/D converter after POR. If STBY# is low at power-
up, INT_TEMP and EXT_TEMP will remain in POR state (0000
0000b). **MFR_REV will sequence 01h, 02h, 03h, etc. by mask-
ing changes.
TCM1617-1 2/5/99
12
 2001 Microchip Technology Inc. DS21485A