EMPCD081A Datasheet, PDF (6/19 Pages) ELAN Microelectronics Corp – 8-Digit Calculator With Tax / Euro Function(Battery / Solar / DualPower Type)

EMPCD081A
8-Digit Calculator With Tax / Euro Function (Battery / Solar / Dual Power Type)
3 Pin Descriptions
Symbol
COM1~3
A1 ~ A3
A4 ~ A13
B1 ~ B3
B4 ~ B13
C1 ~ C2
C3 ~ C13
VDD,VSS
VA,VB
VEE
TS1
RESET
K0 ~ K2
K3 ~ K7
K8 ~ K10
K11~K14
I/O
Function
O
LCD Common signal output.
O
LCD Segment signal output and strobe output for switch status.
O
LCD Segment signal output.
O
LCD Segment signal output and strobe output for switch status.
O
LCD Segment signal output.
O
LCD Segment signal output and strobe output for switch status.
O
LCD Segment signal output.
---
Positive and negative power supply pin.
---
Voltage doubler for LCD, connects a capacitor (0.1uF) between both pins.
---
LCD voltage from voltage doubler, connects a capacitor (0.1uF) to pin VDD.
I
Test pin input, be opened.
I
System reset / AC key input. (built-in schmitt trigger for debouncing)
O
Keyboard polling signal output pins.
I/O
Keyboard polling signal output and strobe input pins.
I
Keyboard strobe input pins.
I
Switch status strobe input pins.
4 Function Descriptions
A) Operation Characteristics
CONSTANT OPERATION
The EM34011 has implied constant mode on +, -, X, ÷ and % operations. The constant
is performed automatically by the "=" key, "%" key, or "%" key without a constant for
addition, subtraction and division while the first operand is the constant for
multiplication.
NUMBER ENTRY
Numbericals can be entered up to 8-digit.
MEMORY PROTECTION
In any error detection, the memory contents present before the error detection are
protected.
MEMORY INDICATION
If the memory contents are a number other than zero, "M" is indicated in the sign-digit
position.
AUTO POWER OFF
If no key is depressed for a specific period of time, the power supply will automatically
turn off .
2•
Product Specification (V0.3) 09.15.2004
(This specification is subject to change without further notice)