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20 Temperature Sensor/Reference
Voltage Generator (TSRVR)
20.1 Overview
The TSRVR is a peripheral circuit for the internal A/D converter that outputs the internal temperature sensor detec-
tion values and generates the reference voltage. The features of the TSRVR are listed below.
• Includes a temperature sensor that has a linear output characteristic and the sensor output can be measured using
the internal A/D converter without external components being attached.
• Can supply a reference voltage (2.0 V, 2.5 V, or V
• Can supply the reference voltage generated in this circuit to external devices if this IC has the VREFA exclusive
pin.
Figure 20.1.1 shows the TSRVR configuration.
Item
Number of channels
Correspondence between TSRVR and internal A/D
converter channels
A/D converter input connected to temperature sensor
Reference voltage output to external devices
TSRVR Ch.n
2.0 V
V
Note: In this chapter, n and m refer to a TSRVR channel number and an internal A/D converter channel
number, respectively.
20.2 Output Pin and External Connections
20.2.1 Output Pin
Table 20.2.1.1 shows the TSRVR pin.
Pin name
I/O
VREFAm
A
If the port is shared with the TSRVR pin and other functions, the TSRVR output function must be assigned to the
port before activating the TSRVR. For more information, refer to the "I/O Ports" chapter.
S1C31D41 TECHNICAL MANUAL
(Rev. 1.1)
20 TEMPERATURE SENSOR/REFERENCE VOLTAGE GENERATOR (TSRVR)
DD
Table 20.1.1 TSRVR Configuration of S1C31D41
VREFAMD[1:0]
V
DD
+
–
2.5 V
V
SS
SS
Temperature
TEMPEN
sensor
Figure 20.1.1 TSRVR Configuration
Table 20.2.1.1 TSRVR Pin
Initial status
Hi-Z
Reference voltage output
Seiko Epson Corporation
selectable) to the internal A/D converter.
S1C31D41
1 channel (Ch.0)
TSRVR Ch.0 → ADC12A Ch.0
ADIN07
Unavailable
Internal
VREFAm
A/D converter
Ch.m
ADINmx
Function
VREFAm
20-1
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