HT46R74D-1 Holtek Semiconductor, HT46R74D-1 Datasheet - Page 3

• Manufacturer Part Number: HT46R74D-1
• Description: Dual Slope A/D Type MCU
• Manufacturer: Holtek Semiconductor

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Pin Description
Rev. 1.10
PA0/BZ
PA1/BZ
PA2
PA3/PFD
PA4/TMR0
PA5/TMR1
PA6/INT0
PA7/INT1
PB0~PB1
VLCD
VMAX
V1, V2, C1, C2
COM0~COM2
COM3/SEG15
SEG0~SEG14
VOBGP
VOREG
VOCHP
CHPC1
CHPC2
DOPAN,
DOPAP,
DOPAO,
DCHOP
DSRR,
DSRC,
DSCC
OSC1
OSC2
OSC3
OSC4
RES
VDD
VSS
AVSS
Pin Name
AI/AO
AI/AO
AO
I/O
I/O
I/O
O
O
O
O
O
O
I
I
I
1/2, 1/3 or 1/4
System Clock
Crystal or RC
Wake-up
Segment
Pull-high
Pull-high
Options
RTC or
Buzzer
Output
PFD
Duty
Bidirectional 8-bit input/output port. Each individual pin on this port can
be configured as a wake-up input by a configuration option. Software in-
structions determine if the pin is a CMOS output or Schmitt trigger input.
Configuration options determine which pins on this port have pull-high re-
sistors. The BZ/BZ, PFD, TMR0/TMR1, INT0/INT1 are pin-shared with
PA0/1, PA3, PA4/5, and PA6/7, respectively.
Bidirectional 2-bit input/output port. Software instructions determine if the
pin is a CMOS output or Schmitt trigger input. Configuration options de-
termine which pins on this port have pull-high resistors.
LCD power supply
IC maximum voltage. Connect to VDD, VLCD or V1
LCD voltage pump
COM0~COM3 are the LCD common outputs. A configuration option se-
lects the LCD duty-cycle. When either 1/3 or 1/2 duty is selected, the
COM3/SEG15 pin will be configured as SEG15.
LCD driver outputs for the LCD panel segments.
Band gap voltage output pin. (for internal use)
Regulator output - 3.3V
Charge pump output - requires external capacitor
Charge pump capacitor, positive
Charge pump capacitor, negative
Dual Slope converter pre-stage OPA related pins. DOPAN is the OPA
Negative input pin, DOPAP is the OPA Positive input pin, DOPAO is the
OPA output pin and DCHOP is the OPA Chopper pins.
Dual slope AD converter main function RC circuit. DSRR is the input or
reference signal, DSRC is the Integrator negative input, and DSCC is the
comparator negative input.
OSC1, OSC2 are connected to an external RC network or crystal for the
internal system clock. The OSC2 pin can be used to monitor the system
clock at 1/4 frequency.
OSC3, OSC4 are connected to a 32768Hz crystal to form a real time
clock for timing purposes or to form a system clock.
Schmitt trigger reset input, active low
Positive power supply
Negative power supply, ground
Analog negative power supply, ground
3
Description
HT46R74D-1
January 11, 2007