STCN75M2E STMicroelectronics, STCN75M2E Datasheet - Page 17

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

Specifications of STCN75M2E

• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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