GA1621 Pad Coordinates
GA1621 Pad Descriptions
Chip selection input with pull-high resistor.
When the CS- is logic high, the data and command read from or written to the GA1621
I are disabled. The serial interface circuit is also reset. But if CS- is at logic low level and
is input to the CS- pad, the data and command transmission between the host controller
and the GA1621 are all enabled.
READ clock input with pull-high resistor.
Data in the RAM of the GA1621 are clocked out on the falling edge of the RD- signal.
I The clocked out data will appear on the DATA line. The host controller can use the next
rising edge to latch the clocked out data.
WRITE clock input with pull-high resistor. Data on the DATA line are latched into the
GA1621 on the rising edge of the WR-signal.
I/O Serial data input/output with pull-high resistor
-- Negative power supply, ground
O The OSCI and OSCO pads are connected to a 32.768kHz crystal in order to generate a
system clock. If the system clock comes from an external clock source, the external
I clock source should be connected to the OSCI pad. But if and on-chip RC oscillator is
selected instead, the OSCI and OSCO pads can be left open.
I VLCD I LCD power input
-- Positive power supply
10 IRQ O Time base or WDT overflow flag, NMOS open drain output
O 2kHz or 4kHz tone frequency output pair
13~116 COM0~COM3 O LCD common outputs
SEG0 ~ 31 O LCD segment outputs
GA1621 Absolute Maximum Ratings
Supply Voltage ---------------------- -0.3V ~ 5.5V
Input Voltage -------- VSS - 0.3V ~ VDD + 0.3V
Storage Temperature ------------------ -50 ℃ ~ 125℃
Operating Temperature ---------------- -25 ℃ ~ 75 ℃
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