HD66727 Datasheet, PDF (13/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
Table 3 Pin Functional Description (cont)
Signal
Number of
Pins
I/O
Connected to Function
SEG1/60– 60
SEG60/1
O
LCD
Segment output signals for segment-icon display and
character display. In the sleep mode (SLP = 1) or
standby mode (STB = 1), all pins output V_CC level.
The SGS bit can change the shift direction of the
segment signal. For example, if SGS = 0, SEG1/60 is
SEG1. If SGS = 1, SEG1/60 is SEG60.
ACOM
1
ASEG1– 12
ASEG12
O
LCD
O
LCD
Common output signal for annunciator display; can drive
display statically between V_CC and AGND levels; outputs
V_CC level while annunciator display is turned off (DA = 0).
Segment output signals for annunciator display; can
drive display statically between V_CC and AGND levels;
output V_CC level while annunciator display is turned off
(DA = 0).
V2, V3
2
I
Open or short- V2 and V3 are voltage levels for the internal operational
circuited
amplifiers; can drive LCD with 1/4 bias when V2 and V3
are short-circuited and with 1/6 bias when they are left
disconnected.
VREFP, 3
VREF,
VREFM
I
Open or short- Adjusts the driving capability of the internal operational
circuited
amplifiers according to the LCD power suppoly voltage.
LCD Power Supply
Voltage (V_CC–V_EE)
V_CC–V_EE: 3V–5V
Pin Settings VREF,
VREFP, and VREFM
Only VREF and VREFP
shorted
V_CC–V_EE: 4V–6V
V_CC–V_EE: 5V–8V
V_CC–V_EE: 7V or more
All pins open
All pins shorted
Only VREF and VREFM
shorted
V1OUT– 5
V5OUT
I or O
Open or
external
bleeder-resistor
Used for output from the internal operational amplifiers
when they are used (OPOFF = GND); when amplifiers'
driving capability is insufficient, attach a capacitor to
stabilize the output. Especially these capacitors for
V1OUT and V4OUT must be attached in 1/26 duty and
1/34 duty. When the amplifiers are not used (OPOFF =
V_CC), V1 to V5 voltages can be supplied to these pins
externally.
V_EE
2
V_CC, GND 8
AGND
1
—
Power supply GND power supply for LCD drive. V_CC – V_EE ≤ 13V.
—
Power supply V_CC: +2.4V to +5.5V; GND (logic): 0V
— Power supply Low level power supply for annunciator display; can
adjust contrast of annunciators; AGND ≥ GND.
OSC1,
2
OSC2
— Oscillation-
For R-C oscillation, connect an external resistor. For
resistor or clock external clock supply, input clock pulses to OSC1.
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