HD66727 Datasheet, PDF (92/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
8. Applies to resistor values (R_COM) between power supply pins V_CC, V1OUT, V4OUT, V5OUT and
common signal pins (COM1 to COM32, COMS1, and COMS2), and resistor values (R_SEG) between
power supply pins V_CC, V2OUT, V3OUT, V5OUT and segment signal pins (SEG1 to SEG60).
9. This excludes the current flowing through pull-up MOSs and output drive MOSs.
10. This excludes the current flowing through the input/output units. The input level must be fixed high or
low because through current increases if the CMOS input is left floating.
11. The following shows the relationship between the operation frequency (f_OSC) and current consumption
(I_CC) (Figure 52).
V_CC = 3V
1/34
Display on (typ.)
40
duty
1/26
duty
30
1/18
Sleep mode (typ.)
duty
20 ^1/10
duty
10
Standby mode (typ.)
0
0 50 100 150 200 250
R-C oscillation frequencies: fosc (kHz)
V_CC = 3V
VREF-VREFP short-circuited
80
VREF left disconnected
VREF = VREFP = VREFM
60
short-circuited
40
VREF-VREFM
short-circuited
20
0
34
5 6 7 8 9 10 11
LCD drive voltages: VLCD (V)
Figure 52 Relationship between the Operation Frequency and Current Consumption
12. Each COM and SEG output voltage is within ±0.15V of the LCD voltage (V_CC, V1, V2, V3, V4, V5)
when there is no load.
13. Applies to the external clock input (Figure 53).
Oscillator
Open
OSC1
OSC2
0.7V_CC
0.5V_CC
0.3V_CC
T_h
T_l
t_rcp
t _fcp
Figure 53 External Clock Supply
Duty =
T_h
T_h+T_l
X 100%
92