Supply Voltage Detector (Svd3); Overview - Epson S1C17M20 Technical Manual

10 Supply Voltage Detector (SVD3)

10.1 Overview

SVD3 is a supply voltage detector to monitor the power supply voltage on the V
external pin. The main features are listed below.
• Power supply voltage to be detected: Selectable from V
• Detectable voltage level:
• Detection results:
• Interrupt:
• Supports intermittent operations:
Figure 10.1.1 shows the configuration of SVD3.
Table 10.1.1 SVD3 Configuration of S1C17M20/M21/M22/M23/M24/M25
Item
Power supply voltage to be detected
Detectable voltage level
SVD3
Clock generator
( )
EXSVD1
EXSVD0
To system reset circuit
To interrupt controller
S1C17M20/M21/M22/M23/M24/M25
TECHNICAL MANUAL (Rev. 1.0)
and external power sources (EXSVD0 and EXSVD1)
Selectable from among 32 levels (max.)
- Can be read whether the power supply voltage is lower than the detection
voltage level or not.
- Can generate an interrupt or a reset when low power supply voltage is de-
tected.
1 system (Low power supply voltage detection interrupt)
- Three detection cycles are selectable.
- Low power supply voltage detection count function to generate an inter-
rupt/reset when low power supply voltage is successively detected the
number of times specified.
- Continuous operation is also possible.
S1C17M20/M23
24-pin package
V : 28 levels (1.8 to 5.0 V)/external voltage: 32 levels (1.2 to 5.0 V)
DD
MODEN
SVDMD[1:0]
CLKSRC[1:0]
CLKDIV[2:0]
DBRUN
SVDC[4:0]
EXSEL
EXSVD0/1
selector
VDSEL
V
DD
SVDSC[1:0]
SVDIE
SVDRE[3:0]
Figure 10.1.1 SVD3 Configuration
Seiko Epson Corporation
10 SUPPLY VOLTAGE DETECTOR (SVD3)
DD
(Note: See the table below.)
S1C17M21/M24
32-pin package
V and one externally input voltage (EXSVD0)
DD
CLK_SVD3
Sampling timing
generator
Voltage
comparator
circuit
Interrupt/reset
control circuit
pin or the voltage applied to an
DD
(Note: See the table below.)
S1C17M22/M25
SVDDT
Detection
SVDIF
result counter
10-1