22 ELECTRICAL CHARACTERISTICS
22-8
Seiko Epson Corporation
S1C17651 TECHNICAL MANUAL
LCD drive voltage-temperature characteristic
LCD drive voltage-load characteristic
VDD = 3.0V, LCD_BCLK[1:0] = 0x1 (2kHz/OSC1A = 32kHz
VDD = 2.2V (VC2 reference)/VDD = 1.8V (VC1 reference),
source clock), FRMCNT[1:0] = 0x1 (64Hz/OSC1A = 32kHz
LCD_BCLK[1:0] = 0x1 (2kHz/OSC1A = 32kHz
(LCLK = 512Hz)), LDUTY[2:0] = 0x3 (1/4 duty),
source clock), FRMCNT[1:0] = 0x1 (64Hz/OSC1A = 32kHz
DSPC[1:0] = 0x1(Normal display), When a 1 M
W load resistor
(LCLK = 512Hz)), LDUTY[2:0] = 0x3 (1/4 duty),
is connected between VSS–VC1, VSS–VC2, and VSS–VC3
DSPC[1:0] = 0x1(Normal display), When a 1 M
W load resistor
(no panel load), Checker pattern displayed, Typ. value
is connected between VSS–VC1, VSS–VC2, and VSS–VC3
(no panel load), Checker pattern displayed, Ta = 25°C, Typ. value
-50
1.04VC3
1.03VC3
1.02VC3
1.01VC3
1.00VC3
0.99VC3
0.98VC3
0.97VC3
0.96VC3
-25
0
25
50
75
100
Ta [
°C]
V
C3
[V]
VC2 reference
VC1 reference
-IVC3 [
A]
V
C3
[V]
0
3.0
2.8
2.6
2.4
2.2
2.0
VC1 reference
VC2 reference
5
10
30
15
20
25
SEG/COM output characteristics
Unless otherwise specified: VDD = 2.0 to 3.6V, VSS = 0V, Ta = -40 to 85°C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Segment/Common output current
ISEGH
SEGxx, COMxx, VSEGH = VC3 - 0.1V
-10
A
ISEGL
SEGxx, COMxx, VSEGL = 0.1V
10
A
LCD driver circuit current consumption
Unless otherwise specified: VDD = 2.2 to 3.6V (VC2 reference)/2.0 to 3.6V (VC1 reference), VSS = 0V, Ta = 25°C, C3–C6 = 0.1F,
Checker pattern displayed, No panel load, PCKEN[1:0] = 0x0 (OFF), LCD_BCLK[1:0] = 0x1 (2kHz/OSC1A = 32kHz source clock),
FRMCNT[1:0] = 0x1 (64Hz/OSC1A = 32kHz (LCLK = 512Hz)), LDUTY[2:0] = 0x3 (1/4 duty), DSPC[1:0] = 0x1(Normal display)
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
LCD circuit current with VC2 reference voltage *1 ILCD2
VCSEL = 1
200
215
nA
LCD circuit current with VC1 reference voltage *1 ILCD1
VCSEL = 0
300
330
nA
Heavy load protection mode
LCD circuit current with VC2 reference voltage *1
ILCD2H
LHVLD = 1, VCSEL = 1
2.2
3.5
A
Heavy load protection mode
LCD circuit current with VC1 reference voltage *1
ILCD1H
LHVLD = 1, VCSEL = 0
1.3
2.0
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.
LCD frame frequency dependence current consumption characteristic
VDD = 3.0V, Ta = 25°C, LCD_BCLK[1:0] = 0x1 (2kHz/OSC1A = 32kHz source clock),
FRMCNT[1:0] = 0x0 to 0x3 (128 to 32Hz/OSC1A = 32kHz (LCLK = 512Hz)), LDUTY[2:0] = 0x3 (1/4 duty),
DSPC[1:0] = 0x1(Normal display), Checker pattern displayed, No panel load, PCKEN[1:0] = 0x0 (OFF), Typ. value
0
20
40
60
80
100
120
140
500
400
300
200
100
0
LCD_FRM [Hz]
ILCD1_FR
[nA]
VC2 reference
VC1 reference