STCN75M2E STMicroelectronics, STCN75M2E Datasheet - Page 17

IC TEMP SENSOR DIGITAL SO-8

STCN75M2E

Manufacturer Part Number
STCN75M2E
Description
IC TEMP SENSOR DIGITAL SO-8
Manufacturer
STMicroelectronics
Datasheet

Specifications of STCN75M2E

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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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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STCN75
3.1.3
3.1.4
Temperature register
The temperature register is a two-byte (16-bit) “Read only” register (see
temperatures from the T-to-D converter are stored in the temperature 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 STCN75 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
STCN75 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 bit 14
contains the temperature MSB. All bits in the temperature register default to zero at power-
up.
Table 7.
1. These are comparable formats to the LM75.
Overlimit temperature register (T
T
upper trip-point temperature for the thermal alarm in two’s complement format (see
on page
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” (x).
STCN75
OS
Bytes
Bits
Keys: S = two’s complement sign bit
register is a two-byte (16-bit) READ/WRITE register that stores the user-programmable
18). This register defaults to 80 °C at power-up (i.e., 0101 0000 0000 0000).
TMSB = temperature MSB
TLSB = temperature LSB
TDx = temperature data bits
MSB
TD8
(S)
15
Temperature register format
(TMSB)
TD7
OS
14
register is identical to that of the temperature register. The MSB
TD
13
6
HS byte
TD
Doc ID 13307 Rev 8
12
5
TMSB
TD
11
4
TD
10
3
OS
(1)
TD
9
2
)
TD
8
1
(TLSB)
TD0
7
6
x
5
x
TLSB
Functional description
LS byte
4
x
Table
3
x
CONV
7). Digital
2
x
OS
(max).
1
x
Table 8
17/37
LSB
0
x

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