STLM75M2E STMicroelectronics, STLM75M2E Datasheet - Page 18

• Manufacturer Part Number: STLM75M2E
• Description: IC TEMP SENSOR DIGITAL SO-8
• Manufacturer: STMicroelectronics

Specifications of STLM75M2E

• Featured Product: STM32 Cortex-M3 Companion Products
• Function: Temp Sensor, Watchdog
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Digital Output - Number Of Bits: 9 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 0.5°C
• Temperature Sensing Range: -55°C To +125°C
• Supply Current: 125µA
• Supply Voltage Range: 2.7V To 5.5V
• Sensor Case Style: SOIC
• No. Of Pins: 8
• Rohs Compliant: Yes
• For Use With: 497-10508 - BOARD EVAL FOR MEMS SENSORS497-10048 - BOARD EVAL ACCELEROMETER497-6238 - BOARD STLM75/STDS75/ST72F651
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional description
3.1.3
Note:
3.1.4
18/40
Temperature register
The temperature register is a two-byte (16-bit) “Read only” register (see
page
register in two’s complement format, and the contents of this register are updated each time
the T-to-D conversion is finished.
The user can read data from the temperature register at any time. When a T-to-D
conversion is completed, the new data is loaded into a comparator buffer to evaluate fault
conditions and will update the temperature register if a read cycle is not ongoing. If a READ
is ongoing, the previous temperature will be read. Accessing the STLM75 continuously
without waiting at least one conversion time between communications will prevent the
device from updating the temperature register with a new temperature conversion result.
Consequently, the STLM75 should not be accessed continuously with a wait time of less
than t
All unused bits following the digital temperature will be zero. The MSB position of the
temperature register always contains the sign bit for the digital temperature, and Bit14
contains the temperature MSB. All bits in the temperature register default to zero at power-
up.
Table 7.
These are comparable formats to the LM75.
Overlimit temperature register (T
The T
programmable upper trip-point temperature for the thermal alarm in two’s complement
format (see
0000 0000).
The format of the T
position contains the sign bit for the digital temperature and Bit14 contains the temperature
MSB.
For 9-bit conversions, the trip-point temperature is defined by the 9 MSBs of the T
register, and all remaining bits are “Don’t cares”.
STLM75
Bytes
Bits
Keys: SB = two’s complement sign bit
18). Digital temperatures from the T-to-D converter are stored in the temperature
CONV
OS
register is a two-byte (16-bit) READ/WRITE register that stores the user-
TMSB = temperature MSB
TLSB = temperature LSB
TDx = temperature data bits
(Sign)
MSB
TD8
(max).
15
Table 8 on page
Temperature register format
(TMSB)
TD7
OS
14
register is identical to that of the temperature register. The MSB
TD
13
6
HS byte
19). This register defaults to 80 °C at power-up (i.e., 0101 0000
Doc ID 13296 Rev 12
TD
12
5
TMSB
TD
11
4
TD
10
3
OS
TD
9
2
)
TD
8
1
(TLSB)
TD0
7
6
0
5
0
TLSB
LS byte
4
0
Table 7 on
3
0
2
0
OS
STLM75
1
0
LSB
0
0