參數(shù)資料
型號： ASC7511
廠商： Electronic Theatre Controls, Inc.
元件分類： 溫度/濕度傳感器
英文描述： LOW- OLTAGE 2-WIRE DIGITAL TEMPERATURE SENSOR
中文描述： 低OLTAGE 2 - Wire數(shù)字溫度傳感器
文件頁數(shù)： 5/19頁
文件大?。?/td> 273K
代理商： ASC7511
- 5 -
Andigilog, Inc. 2006
www.andigilog.com
August 2006 - 70A04010
aSC7511
Basic Operation Overview
The aSC7511 temperature sensing circuitry continuously
monitors two thermal diode base-emitter voltages, one on-
chip, called “l(fā)ocal” and one remotely located, connected to
the D+ and D- pins. At regular intervals the aSC7511
converts both analog voltages to digital values, which are
placed into the temperature registers.
The aSC7511 has an SMBus-compatible serial interface
that allows the user to access the data in the temperature
registers at any time. In addition, the serial interface gives
the user easy access to all other aSC7511 registers to
customize operation of the device.
The aSC7511 temperature-to-digital converter has two
temperature formats, 0
°
C to +127
°
C binary and extended-
range, -55
°
C to +150
°
C, offset-binary. The local sensor
resolution is 8-bits, with an LSB of 1
°
C. The remote or
remote diode sensor resolution is 10-bits with an LSB of
0.25
°C
. The temperature range of the local and remote
sensors are controlled by bit 2 of the configuration register,
default value is 0, 0
°
C to 127
°
C.
Table 1 gives examples of the relationship between the
output digital data and the measured temperature for the
default range. Table 2 gives examples for the extended
range. All output values are offset by +64
°
C when in this
mode.
The aSC7511 has a Shutdown Mode that reduces the
operating current to < 20μA. This mode is controlled by
RUN / STOP, bit 6 in the configuration register.
Comparisons to limits and diode open test are suspended
until the next measurement has taken place.
Digital Output (Binary)
High Byte
Low Byte
Temperature
Always Zero
Local Sensor
Remote Sensor
8-Bit Resolution
00
00
00
0000
0000
10-Bit Resolution
>127
°
C
+127
°
C
+125
°
C
+100
°
C
+50
°
C
+25
°
C
+10
°
C
+1.75
°
C
+0.25
°
C
0
°
C
< 0
°
C
0111
0111
0111
0110
0011
0001
0000
0000
0000
0000
0000
1111
1111
1101
0100
0010
1001
1010
0001
0000
0000
0000
00
00
00
00
00
00
00
11
01
00
00
00
00
00
00
00
00
00
00
00
00
00
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
Table 1. Relationship Between Temperature and Digital
Output, Default Range, 0
°
C to +127
°
C
Digital Output (Offset Binary)
High Byte
Low Byte
Temperature
Always Zero
Local Sensor
Remote Sensor
8-Bit Resolution
10-Bit Resolution
00
00
00
0000
0000
+150
°
C
+127
°
C
+125
°
C
+100
°
C
+50
°
C
+25
°
C
+10
°
C
+1.75
°
C
+0.25
°
C
0
°
C
-55
°
C
1101
1011
1011
1010
0111
0101
0100
0100
0100
0100
0000
0110
1111
1101
0100
0010
1001
1010
0001
0000
0000
1001
00
00
00
00
00
00
00
11
01
00
00
00
00
00
00
00
00
00
00
00
00
00
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
Table 2. Relationship Between Temperature and Digital
Output, Extended Range, -55
°
C to +150
°
C
Power-Up Default Conditions
The aSC7511 always powers-up in the following default
state:
Configuration Register: 00h (i.e.,
ALERT
enabled, Run
Mode,
ALERT
pin selected, normal range)
Conversion Rate: 16 per second, 08h
All Temperature and Offset Registers: 00h
Consecutive
ALERT
: 1 fault (i.e., 01h in the register)
Local and Remote Low Limit: 0°C
Local and Remote
THERM
Limit: 85°C
THERM
Hysteresis: 10°C
Register Address Pointer: Undefined, must be set by
first write sequence.
Normal / Extended Range: Normal
After power-up, these conditions can be reprogrammed via
the serial interface. Refer to the Serial Data Bus Operation
section to for aSC7511 programming instructions.
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