STTS424BDN3F STMicroelectronics, STTS424BDN3F Datasheet - Page 22

• Manufacturer Part Number: STTS424BDN3F
• Description: IC MEMORY MOD TEMP SENSOR 8-TDFN
• Manufacturer: STMicroelectronics

Specifications of STTS424BDN3F

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8502-2

Temperature sensor registers
4.3
4.3.1
Table 12.
1. See
22/36
input
critical
Above
Bit
15
0
0
(1)
Table 13
window
Flag bits
Flag bits
Temperature register (read-only)
This 16-bit, read-only register stores the temperature measured by the internal band gap TS
as shown
requirement. When reading this register, the MSBs (bit 15 to bit 8) are read first, and then
the LSBs (bit 7 to bit 0) are read. The result is the current-sensed temperature. The data
format is 2s complement with one LSB = 0.25°C. The MSB has a 128°C resolution.
The trip status bits represent the internal temperature trip detection, and are not affected by
the status of the event or configuration bits (e.g. event output control or clear event). If
neither of the above or below values are set (i.e. both are 0), then the temperature is exactly
within the user-defined alarm window boundaries.
Temperature format
The 16-bit value used in the trip point set and temperature read-back registers is 2s
complement, with the LSB equal to 0.0625°C (see
1.
2.
3.
The 0.0625°C resolution is optional. Supporting a resolution of at least 0.25°C is mandatory.
All unused resolution bits will be set to zero. The MSB will have a resolution of 128°C. The
STTS424 supports the 0.25°C/LSB only.
The upper 3 bits indicate trip status based on the current temperature, and are not affected
by the event output status.
Temperature register format
Above
alarm
for explanation.
Bit
14
0
0
a value of 019Ch will represent 25.75°C,
a value of 07C0h will represent 124°C, and
a value of 1E74h will represent –24.75°C
(1)
window
inTable
Below
alarm
Bit
13
0
0
(1)
12. The STTS424 meets the JEDEC JC42.4 mandatory 0.25°C resolution
Sign
MSB
Bit
12
0
1
Bit
11
0
1
Example hex value of 07C0 corresponds to 124°C (10-bit)
Example hex value of 1C00 corresponds to –40°C (10-bit)
Bit
10
1
1
Bit
9
1
0
Bit
Temperature
8
1
1
Bit
7
1
1
Bit
6
1
0
Table
Bit
5
0
0
Bit
13). For example:
4
0
0
Bit
3
0
0
LSB
Bit
2
0
0
Bit
1
0
0
0
Bit
0
0
0
0
STTS424
07C0 h
1C00 h