MAX1617 ON Semiconductor, MAX1617 Datasheet - Page 9

• Manufacturer Part Number: MAX1617
• Description: SMBus Temperature Sensor with Internal and External Diode Input
• Manufacturer: ON Semiconductor

REGISTER SET AND PROGRAMMER’S MODEL
MAX1617 Command Set
protocols. These are READ_BYTE, WRITE_BYTE,
SEND_BYTE, and RECEIVE_BYTE. See System
Management Bus Specification Rev. 1.0 for details.
Command Byte Description
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 MAX1617 will ACKnowledge the
address and return 1111 1111b to signify an error. Under no condition
will it implement an SMBus “timeout.”
Command
The MAX1617 supports four SMBus command
RMREV
WEHL
REHL
WELL
OSHT
RELL
WIHL
RMID
WCR
WILL
RCR
RIHL
RET
RILL
RIT
WC
RS
RC
Write Byte Format
Read Byte Format
Send Byte Format
S = Start Condition
P = Stop Condition
Shaded = Slave Transmission
S
S
Slave Address
S
ADDRESS WR
ADDRESS WR
Code Function
0Ah
0Bh
0Ch
0Dh
0Eh
FEh
FFh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Fh
7 Bits
7 Bits
Slave Address
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 Byt3
(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)
ADDRESS
7 Bits
ACK
ACK
Command Byte: selects
which register you
reading from.
Command Byte: sends
command with no data,
usually used for one–shot
command.
COMMAND
COMMAND
WR
8 Bits
8 Bits
Figure 3. SMBus Protocols
ACK
ACK
ACK
http://onsemi.com
Command Byte: selects
which register you
writing to.
MAX1617
COMMAND
S
P
8 Bits
9
Slave Address: repeated
due to change in data–
flow direction.
ADDRESS
7 Bits
Receive Byte Format
S
ACK
ADDRESS
RD
7 Bits
ACK
Data Byte: data goes
into the register set
by the command byte.
DATA
8 Bits
RD
DATA
Data Byte: reads from
the register set by the
command byte.
8 Bits
ACK
ACK
Data Byte: reads data from
the register commanded by
the last Read Byte.
NACK
DATA
8 Bits
P
P
NACK
P