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18 SuPPlY VOlTaGe DeTeCTiOn CiRCuiT (SVD)
S1C17153 TeChniCal Manual
Seiko epson Corporation
18-3
(Rev. 1.0)
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)
D7–5
–
reserved
–
–
–
0 when being read.
D4–0
SVDC[4:0]
SVD comparison voltage select
SVDC[4:0]
Voltage
0x0 R/W
0x1f–0x1b
0x1a
0x19
0x18
0x17
0x16
0x15
0x14
0x13
0x12
0x11
0x10
0xf
0xe
0xd–0x0
reserved
3.18 V
3.08 V
2.98 V
2.88 V
2.78 V
2.68 V
2.58 V
2.48 V
2.38 V
2.28 V
2.18 V
2.08 V
1.98 V
reserved
D[7:5]
Reserved
D[4:0]
SVDC[4:0]: SVD Comparison Voltage Select Bits
Selects one of 13 comparison voltages for detecting voltage drops.
4.2 Comparison Voltage Settings
Table 18.
SVDC[4:0]
Comparison Voltage
SVDC[4:0]
Comparison Voltage
0x1f
Reserved
0xf
2.08 V
0x1e
0xe
1.98 V
0x1d
0xd
Reserved
0x1c
0xc
0x1b
0xb
0x1a
3.18 V
0xa
0x19
3.08 V
0x9
0x18
2.98 V
0x8
0x17
2.88 V
0x7
0x16
2.78 V
0x6
0x15
2.68 V
0x5
0x14
2.58 V
0x4
0x13
2.48 V
0x3
0x12
2.38 V
0x2
0x11
2.28 V
0x1
0x10
2.18 V
0x0
(Default: 0x0)
The SVD circuit compares the power supply voltage (V
DD
) against the comparison voltage set by
SVDC[4:0], and outputs results indicating whether the power supply voltage exceeds this comparison
voltage.
note
: The comparison voltage is effective only when it is set within the operating voltage range. If
the comparison voltage set is out of the operating voltage range, no correct detection results
will be obtained.