sx8744emstrt Semtech Corporation, sx8744emstrt Datasheet - Page 16

• Manufacturer Part Number: sx8744emstrt
• Description: Precision Diode Digital Temperature For Up To 3 External Sensors
• Manufacturer: Semtech Corporation

7. Register / Memory Map
Each register is described in the following register memory map. These are identified by a Register Name and
corresponding hexadecimal register address.
7.1. Memory Map
7.2. Registers Description
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
Bits
7:6
4:0
0x2A
0x2B
0x2C
0x2D
0x2E
0x00
0x06
0x07
0x20
0x21
0x22
0x23
0x24
0x25
0x26
0x27
0x28
0x29
0x2F
0x30
0x31
5
SetInterface
Reserved
RegExtTemp1MSB
RegExtTemp2MSB
RegExtTemp3MSB
RegDeviceVersion
RegExtTemp1LSB
RegExtTemp2LSB
RegExtTemp3LSB
RegIntTempMSB
RegIntTempLSB
Name
Mode
RegAlarmHyst
RegADCRate
RegExtOffset
RegDeviceID
RegAlarmSet
RegExtGain
RegControl
RegSensor
RegAlarm1
RegAlarm2
RegConfig
RegStatus
Mode
rw
rw
rw
Determines the chip variant and the communication interface (I2C or SMBus)
Sets the calibration gain for remote temperature measurement
Sets the calibration offset for remote temperature measurement
Read-only ID = 0x33
Read-only circuit revision
Defines which sensors are scanned in sequence
Alarm1 threshold
Alarm2 threshold
Defines which sensors control alarms 1 and 2, and whether over-/under- temperature triggers for
each alarm
Alarm hysteresis
Temperature conversion rate
T
T
T
T
T
T
T
T
General Control register
General Status register
J
J
D1
D1
D2
D2
D3
D3
temperature reading for internal sensor, integer part, LSB = 1ºC
temperature reading for internal sensor, fractional part, LSB = 0.125ºC
temperature reading for external sensor 1, integer part, LSB = 1ºC
temperature reading for external sensor 1, fractional part, LSB = 0.125ºC
temperature reading for external sensor 2, integer part, LSB = 1ºC
temperature reading for external sensor 2, fractional part, LSB = 0.125ºC
temperature reading for external sensor 3, integer part, LSB = 1ºC
temperature reading for external sensor 3, fractional part, LSB = 0.125ºC
Reset
00000
00
1
Configuration Registers
Table 6 Memory map
Identification Registers
Temperature Registers
Addr: 0x00 RegConfig
Description
Write to 00
Select between I2C or SMBus interface
0: I2C (Time Out Disabled)
1: SMBUS
Select the configuration mode
00000: Mode 0
00001: Mode 1
...
10010: Mode 18
10100: Mode 20
General Registers
Page 16
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
www.semtech.com
DATASHEET