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PDF ( 数据手册 , 数据表 ) STCN75

零件编号 STCN75
描述 Digital temperature sensor and thermal watchdog
制造商 STMicroelectronics
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STCN75 数据手册, 描述, 功能
STCN75
Digital temperature sensor and thermal watchdog
Features
Measures temperatures from –55°C to +125°C
(–67°F to +257°F)
– ±2°C accuracy from –25°C to
+100°C (max)
Low operating current:125 µA (typ)
No external components required
2-wire I2C/SMBus-compatible serial interface
– Selectable bus address allows connection
of up to eight devices on the bus
Wide power supply range-operating voltage
range: 2.7 V to 5.5 V
Conversion time is 45 ms (typ)
Programmable temperature threshold and
hysteresis set points
Pin- and software-compatible with TCN75
(Drop-in replacement)
Power-up defaults permit standalone operation
as a thermostat
Shutdown mode to minimize power
consumption
Output pin (open drain) can be configured for
interrupt or comparator/thermostat mode (dual
purpose event pin)
Packages:
– SO8
– MSOP8 (TSSOP8)
SO8 (M)
MSOP8
(TSSOP8) (DS)
July 2008
Rev 6
1/35
www.st.com
1







STCN75 pdf, 数据表
Description
Figure 2. Connections (SO8 and TSSOP8)
SDA(1)
SCL
OS/INT(1)
GND
1
2
3
4
8 VDD
7 A0
6 A1
5 A2
AI11841
1. SDA and OS/INT are open drain.
Figure 3. Functional block diagram
STCN75
VDD
Temperature
Sensor and
Analog-to-Digital
Converter (ADC)
S-D
Configuration Register
Temperature Register
THYS Set Point Register
TOS Set Point Register
Pointer Register
Control and Logic
Comparator
A0
A1 2-wire I2C Interface
A2
GND
OS/INT
SDA
SCL
AI11833a
1.3
1.3.1
1.3.2
1.3.3
8/35
Pin descriptions
See Figure 1 on page 7 and Table 1 on page 7 for a brief overview of the signals connected
to this device.
SDA (open drain)
This is the serial data input/output pin for the 2-wire serial communication port.
SCL
This is the serial clock input pin for the 2-wire serial communication port.
OS/INT (open drain)
This is the over-limit signal/interrupt alert output pin. It is open drain, so it needs a pull-up
resistor. In Interrupt mode, it outputs a pulse whenever the measured temperature exceeds
the programmed threshold (TOS). It behaves as a thermostat, toggling to indicate whether
the measured temperature is above or below the threshold and hysteresis (THYS).







STCN75 equivalent, schematic
Functional description
STCN75
3.1.2
Table 5. Register pointers selection summary
Pointer
value (H)
P1
P0
Name
Description
Width
(bits)
Type
(R/W)
Power-on
default
Comments
00
0
0
TEMP
Temperature
register
16
Read-
only
N/A
To store measured
temperature data
01
0
1
CON Configuration
F register
8
R/W
00
02
1
0
THYS
Hysteresis
register
16 R/W 4B00 Default = 75°C
03
Over-
1 1 TOS temperature 16 R/W
shutdown
5000
Set point for over-
temperature shutdown
(TOS) limit default =
80°C
Configuration register
The configuration register is used to store the device settings such as device operation
mode, OS/INT operation mode, OS/INT polarity, and OS/INT fault queue.
The Configuration register allows the user to program various options such as thermostat
fault tolerance, thermostat polarity, thermostat operating mode, and shutdown mode. The
user has READ/WRITE access to all of the bits in the configuration register except the MSB
(Bit7), which is reserved as a “Read only” bit (see Table 6). The entire register is volatile and
thus powers-up in its default state only.
Table 6. Configuration register format
MSB
LSB
Byte
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
STCN75
0
0
0
FT1 FT0 POL
M
SD
Default
0
0
0
0
0
0
0
0
Keys: SD = shutdown control bit
M = thermostat mode(1)
POL = output polarity(2)
FT1 = fault tolerance1 bit
Bit 5 = must be set to '0'.
Bit 6 = must be set to '0'.
FT0 = fault tolerance0 bit
Bit 7 = must be set to '0'.
1. Indicates operation mode; 0 = comparator mode, and 1 = interrupt mode (see Section 2.3: Comparator
mode and Section 2.4: Interrupt mode).
2. The OS is active-low ('0').
16/35










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