Hardware Reference
In-Depth Information
11.7.1 Pin Assignment
As shown in Figure 11.31, the DS1631A is an eight-pin package. The SDA and SCL pins
are used as the data and clock lines so that the DS1631A can be connected to an I 2 C bus. Pins
A2,A0 are address inputs to the DS1631A. The T OUT pin is the thermostat output, which is as-
serted whenever the ambient temperature is above the trip point set by the designer.
SDA
1
8
V DD
A 0
SCL
2
7
DS1631A
T OUT
A 1
3
6
GND
4
5
A 2
Figure 11.31 Pin assignment
of DS1631A
11.7.2 Functional Description
The block diagram of the DS1631A is shown in Figure 11.32. The DS1631A converts the
ambient temperature into 9-, 10-, 11-, or 12-bit readings over a range of 255 to 1125
°
C. The
thermometer accuracy is 60.5
C with 3.0 V # V DD # 5.5 V.
The thermostat output T OUT is asserted whenever the converted ambient temperature is
equal to or higher than the value stored in the T H register. The DS1631A automatically begins
°
C from 0 to 170
°
V DD
Configuration register
and control logic
SCL
Temperature sensor
and
ΔΣ
ADC
SDA
Address
and
I/O control
Temperature register
A 0
A 1
T H register
A 2
Digital
comparator/
logic
T OUT
T L register
GND
Figure 11.32 DS1631A functional diagram
 
 
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