
26 SuPPlY VOlTaGe DeTeCTOR (SVD)
26-4
Seiko epson Corporation
S1C17624/604/622/602/621 TeChniCal Manual
D0
SVDen: SVD enable Bit
Enables or disables SVD operations.
1 (R/W): Enabled
0 (R/W): Disabled(default )
Setting SVDEN to 1 initiates power supply voltage detection; setting to 0 stops detection.
notes: • An SVD circuit-enable response time is required to obtain stable detection results after
SVDEN is altered from 0 to 1. Also when SVDC[3:0] is altered, an SVD circuit response
time is required to obtain stable detection results. For these response times, see “Electrical
Characteristics.”
• Operating the SVD circuit increases current consumption. If power supply voltage detection
is not required, stop SVD operations by setting SVDEN to 0.
SVD Comparison Voltage Register (SVD_CMP)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
SVD
Comparison
Voltage Register
(SVD_CMP)
0x5101
(8 bits)
D7–4 –
reserved
–
–
–
0 when being read.
D3–0 SVDC[3:0] SVD comparison voltage select
SVDC[3:0]
Voltage
0x0 R/W
0xf
0xe
0xd
0xc
0xb
0xa
0x9
0x8
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
3.2 V
3.1 V
3.0 V
2.9 V
2.8 V
2.7 V
2.6 V
2.5 V
2.4 V
2.3 V
2.2 V
2.1 V
2.0 V
1.9 V
1.8 V
reserved
D[7:4]
Reserved
D[3:0]
SVDC[3:0]: SVD Comparison Voltage Select Bits
Selects one of 15 comparison voltages for detecting voltage drops.
6.2 Comparison Voltage Settings
Table 26.
SVDC[3:0]
Comparison voltage
0xf
3.2 V
0xe
3.1 V
0xd
3.0 V
0xc
2.9 V
0xb
2.8 V
0xa
2.7 V
0x9
2.6 V
0x8
2.5 V
0x7
2.4 V
0x6
2.3 V
0x5
2.2 V
0x4
2.1 V
0x3
2.0 V
0x2
1.9 V
0x1
1.8 V
0x0
Reserved
(Default: 0x0)
The SVD circuit compares the power supply voltage (V
DD
) against the comparison voltage set by
SVDC[3:0], and outputs results indicating whether the power supply voltage exceeds this comparison
voltage.