EMC1402-1-ACZL-TR SMSC, EMC1402-1-ACZL-TR Datasheet - Page 31

• Manufacturer Part Number: EMC1402-1-ACZL-TR
• Description: IC TEMP SNSR DUAL 3.3V 8MSOP
• Manufacturer: SMSC

Specifications of EMC1402-1-ACZL-TR

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• For Use With: EVB-EMC1402 - EVAL BOARD FOR EMC1402
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1067-2

1°C Temperature Sensor with Beta Compensation
Datasheet
SMSC EMC1402
6.12
ADDR.
25h
2
0
0
0
1
R/W
R/W
Bits 6-4 - CTHRM[2:0] - Determines the number of consecutive measurements that must exceed the
corresponding THERM Limit before the THERM pin is asserted. All temperature channels use this
value to set the respective counters. The consecutive THERM counter is incremented whenever any
measurement exceed the corresponding THERM Limit.
If the temperature drops below the THERM limit, then the counter is reset. If a number of consecutive
measurements above the THERM limit occurs, then the THERM pin is asserted low.
Once the THERM pin has been asserted, the consecutive therm counter will not reset until the
corresponding temperature drops below the THERM Limit minus the THERM Hysteresis value.
The bits are decoded as shown in
conversions.
Bits 3-1 - CALRT[2:0] - Determine the number of consecutive measurements that must have an out of
limit condition or diode fault before the ALERT pin is asserted. All temperature channels use this value
to set the respective counters. The bits are decoded as shown in
consecutive out of limit conversion.
This register is used to set the Beta Compensation factor that is used for the external diode channel.
Bit 3 - ENABLE - Enables the Beta Compensation factor autodetection function.
Bit 2-0 - BETA[2:0] - These bits always reflect the current beta configuration settings. If autodetection
circuitry is enabled, then these bits will be updated automatically and writing to these bits will have no
effect. If the autodetection circuitry is disabled, then these bits will determine the beta configuration
setting that is used for their respective channels.
Care should be taken when setting the BETA[2:0] bits when the autodetection circuitry is disabled. If
the Beta Compensation factor is set at a beta value that is higher than the transistor beta, then the
circuit may introduce measurement errors. When measuring a discrete thermal diode (such as
Beta Configuration Registers
‘0’ - The Beta Compensation Factor autodetection circuitry is disabled. The External Diode will
always use the Beta Compensation factor set by the BETA[2:0] bits.
‘1’ (default) - The Beta Compensation factor autodetection circuitry is enabled. At the beginning of
every conversion, the optimal Beta Compensation factor setting will be determined and applied.
The BETA[2:0] bits will be automatically updated to indicate the current setting.
Diode 1 Beta
Configuration
REGISTER
External
1
0
0
1
1
Table 6.13 Consecutive Alert / THERM Settings
Table 6.14 Beta Configuration Registers
B7
-
0
0
1
1
1
B6
-
DATASHEET
Table
B5
-
31
6.13. The default setting is 4 consecutive out of limit
NUMBER OF CONSECUTIVE OUT OF LIMIT
B4
-
ENABLE
(default for CTHRM[2:0])
(default for CALRT[2:0])
B3
MEASUREMENTS
Table
1
2
3
4
B2
6.13. The default setting is 1
BETA[2:0]
B1
Revision 1.36 (07-02-09)
B0
DEFAULT
08h