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IC BLOCK
DIAGRAM
XT
XT
GND
'{nhibit input
This is input port for signal selection of radio mode.
It judges ''radio on" by ''H" level input and ''radio off" by "L," level input.
When this terminal is in ''L.' level, reference output is automatically fixed to ''L" level.
Test mode
This is input terminal for test mode control.
control input
| It becomes
test mode at "H" level and normal mode at "L"' leve! or NC condition.
This terminal has pull down resistor itself and usually it is set to NC or ""L'' level.
X'tal OSC
This is connection terminal for X'tal. Connect 7.2MHz X'tal to this terminal.
terminal
GND terminal | This is ground terminal of device.
Power supply | These are terminals for Vpp. Usually applies 5V + 10% to this terminals.
terminal
Voltage can be reduced to 2V for back up condition.
Also, when OV — 4.5V is applied to these terminals, device will be in system reset and
program start from "0".
Note:
Make power on reset at the ''L" level { = INH) condition.
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