HT45R37V Holtek Semiconductor Inc., HT45R37V Datasheet - Page 4

• Manufacturer Part Number: HT45R37V
• Description: C/r-f Type 8-bit Otp Mcu
• Manufacturer: Holtek Semiconductor Inc.

Note:
Absolute Maximum Ratings
Supply Voltage ...........................V
Input Voltage..............................V
VCC Supply Voltage.....................................12V to 24V
I
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may
Rev. 1.00
OH
PD0/PWM0/RC8
PD1~PD7
RCOUT/IN
RREF
CREF
F1O
BZO
BZO
BZI
VO
VCC
VFD0~VFD23
VDD/AVDD
VSS/AVSS
Total .............................................................. 80mA
cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
1. Pin PB2~PB5 are four internal pins only and not bound out and its port control register must setup this pin
2. PB2~PB5 individual pins can be selected to have a pull-high resistor.
Pin Name
as an output.
I/O
I/O
O
O
O
I
I
I
I
Configuration
SS
SS
0.3V to V
Option
0.3V to V
RC8
DD
SS
+6.0V
+0.3V
Bidirectional 1-bit input/output port. Software instructions deter-
mine if the pin is a CMOS output or Schmitt trigger input. A pull
high resistor can be connected to each pin using the PDPU regis-
ter. The PWM outputs, PWM0, are pin shared with pins PD0, the
function of which is chosen using the PWM registers. The C/R to F
converter inputs RC8 are shared with pins PD0.
These seven pads are internal I/O and not bound out.
Capacitor or resistor connection pin to RC OSC/ Oscillation input.
Reference resistor connection pin
Reference capacitor connection pin
High voltage filament output signal
High voltage buzzer complement output signals
Buzzer control Schmitt Trigger input.
LDO regulator output
High voltage positive power supply for driving the VFD filament,
F1O, BZO and BZO outputs. An external 10uF capacitor is recom-
mended to be connected to ground on the PCB to reduce surge
voltages.
High voltage grid/segment output for VFD panel
Positive power supply/analog positive power supply.
Negative power supply, ground/analog negative power supply,
ground
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Storage Temperature ............................ 50 C to 125 C
Operating Temperature........................... 40 C to 85 C
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Total Power Dissipation .....................................500mW
OL
Total ................................................................80mA
Description
October 20, 2009
HT45R37V