
25 ELECTRICAL CHARACTERISTICS
25-8
Seiko Epson Corporation
S1C17705 TECHNICAL MANUAL
LCD drive voltage-temperature characteristic
LCD drive voltage-load characteristic
Typ. value
When a load is connected to the VC5 pin only
LCx = 0xf, Ta = 25°C, Typ. value
-50
1.05VC5
1.04VC5
1.03VC5
1.02VC5
1.01VC5
1.00VC5
0.99VC5
0.98VC5
0.97VC5
0.96VC5
0.95VC5
-25
0
25
50
75
100
Ta [°C]
V
C5
[V]
0
5.80
5.75
5.70
5.65
5.60
5.55
5.50
4
8
12
16
20
-IVC5 [A]
V
C5
[V]
SEG/COM output characteristics
Unless otherwise specified: VDD = 1.8 to 3.6V, VSS = 0V, Ta = -25 to 70°C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Segment/Common output current
ISEGH
SEGxx, COMxx, VSEGH = VC5 - 0.1V
-5
A
ISEGL
SEGxx, COMxx, VSEGL = 0.1V
5
A
LCD driver circuit current consumption
Unless otherwise specified: VDD = 1.8 to 3.6V, VSS = 0V, Ta = 25°C, C1–C11 = 0.1F, No LCD panel load,
PCKEN[1:0] = 0x0 (OFF), FLCYC[2:0] = 0x4 (1 cycle), CCLKGR[1:0] = 0x0 (gear ratio 1/1)
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
LCD circuit current *1
ILCD1
DSPC[1:0] = 0x2 (all on), LC[3:0] = 0xf,
OSC1 = 32kHz, VDD = 2.5 to 3.6V
7
14
A
DSPC[1:0] = 0x1 (checker pattern),
LC[3:0] = 0xf, OSC1 = 32kHz,
VDD = 2.5 to 3.6V
20
25
A
LCD circuit current
in heavy load protection mode *2
ILCD1H
DSPC[1:0] = 0x2 (all on), LC[3:0] = 0xf,
OSC1 = 32kHz, VDD = 2.5 to 3.6V,
LHVLD = 1
20
25
A
DSPC[1:0] = 0x1 (checker pattern),
LC[3:0] = 0xf, OSC1 = 32kHz,
VDD = 2.5 to 3.6V, LHVLD = 1
30
35
A
LCD circuit current when the power
voltage booster is active *3
ILCD2
DSPC[1:0] = 0x2 (all on), LC[3:0] = 0xf,
OSC1 = 32kHz, PBON = 1,
VDD = 1.8 to 2.5V
10
15
A
DSPC[1:0] = 0x1 (checker pattern),
LC[3:0] = 0xf, OSC1 = 32kHz, PBON = 1,
VDD = 1.8 to 2.5V
40
45
A
LCD circuit current in heavy load
protection mode when the power voltage
booster is active *4
ILCD2H
DSPC[1:0] = 0x2 (all on), LC[3:0] = 0xf,
OSC1 = 32kHz, PBON = 1,
VDD = 1.8 to 2.5V, LHVLD = 1
35
45
A
DSPC[1:0] = 0x1 (checker pattern),
LC[3:0] = 0xf, OSC1 = 32kHz, PBON = 1,
VDD = 1.8 to 2.5V, LHVLD = 1
65
70
A
*1 This value is added to the current consumption in HALT mode or current consumption during execution when the LCD circuit is ac-
tive. Current consumption increases according to the display contents and panel load.
*2 This value is added to the current consumption during execution in heavy load protection mode when the LCD circuit is active.
Current consumption increases according to the display contents and panel load.
*3 This value is added to the current consumption in HALT mode or current consumption during execution when the power voltage
booster and the LCD circuit are active. Current consumption increases according to the display contents and panel load.
*4 This value is added to the current consumption during execution in heavy load protection mode when the power voltage booster
and the LCD circuit are active. Current consumption increases according to the display contents and panel load.