TCM1617 Datasheet, PDF (10/14 Pages) Microchip Technology – SMBus Thermal Sensor with External Diode Input

SMBus Thermal Sensor with External Diode Input
TCM1617
Stop Condition (STOP)
Communications must be terminated by a stop condi-
tion (a Low to High transition of SDA while SCL is High). The
Stop Condition must be communicated by the transmitter to
the TCM1617. (Refer to TCN75 data sheet for serial bus
timing diagrams.)
REGISTER SET AND PROGRAMMER’S
MODEL
TCM1617 Command Set
The TCM1617 supports four SMBus command proto-
cols. These are READ_BYTE, WRITE_BYTE, SEND_BYTE,
and RECEIVE_BYTE. See System Management Bus Speci-
fication Rev. 1.0 for details.
Command Byte Description
Command
RIT
RET
RS
RC
RCR
RIHL
RILL
REHL
RELL
WC
WCR
WIHL
WILL
WEHL
WELL
OSHT
RMID
RMREV
Code
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
FEh
FFh
Function
Read Internal Temp (INT_TEMP)
Read External Temp (EXT_TEMP)
Read Status Byte (STATUS)
Read Configuration Byte (CONFIG)
Read Conversion Rate Byte
(CONV_RATE)
Read Internal High Limit
(INT_HLIM)
Read Internal Low Limit (INT_LLIM)
Read External High Limit
(EXT_HLIM)
Read External Low Limit
(EXT_LLIM)
Write Configuration Byte (CONFIG)
Write Conversion Rate Byte
(CONV_RATE)
Write Internal High Limit
(INT_HLIM)
Write Internal Low Limit (INT_LLIM)
Write External High Limit
(EXT_HLIM)
Write External Low Limit
(EXT_LLIM)
One Shot Temp Measurement
Read Manufacturer ID (MFR_ID)
Read Manufacturer Revision
Number (MFR_REV)
NOTE: Proper device operation is NOT guaranteed if undefined locations
(10h to FDh) are addressed. In case of erroneous SMBus operation
(RECEIVE_BYTE command issued immediately after
WRITE_BYTE command) the TCM1617 will ACKnowledge the
address and return 1111 1111b to signify an error. Under no
condition will it implement an SMBus “timeout.”
Configuration Register (Config), 8-Bits,
Read/Write
Configuration Register (Config)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
Mask1 Chip Stop
Reserved
Bit POR State Function
Operation
D[7]
0
Interrupt Mask 1 = mask ALERT#,
(see text)
0 = don’t mask
ALERT #
D[6]
0
Standby switch 1 = standby,
0 = normal
D[5] – D[0]
0
Reserved –
N/A
Always returns
zero when read.
A/D Conversion Rate Register
(CONV_RATE), 8-Bits, Read/Write
A/D Conversion Rate Register (CONV_RATE)
D[7]
D[6] D[5] D[4] D[3] D[2] D[1] D[0]
Reserved
MSB X LSB
Bit
D[7:3]
D[2:0]
POR State Function
Operation
0
010b
Reserved – Always
returns zero when
read.
Conversion rate bits.
N/A
See below.
A/D Conversion Rate Selection
D2
D1
D0
Conversion Rate
Sa/sec
0
0
0
0.0625
0
0
1
0.125
0
1
0
0.25
0
1
1
0.5
1
0
0
1.0
1
0
1
2.0
1
1
0
4.0
1
1
1
8.0
NOTE: Conversion rate denotes actual sampling of both internal and
external sensors.
TCM1617-1 2/5/99
10
 2001 Microchip Technology Inc. DS21485A