RF / IR Encoder / Decoder Chipset
RF Evaluation Boards,
RF600E
RF600D
SLEEP
Holding this pin high will causes the device to run normally. Holding this pin low will causes the device to
enter a sleep mode where the current drain will be 1µA (typically). Taking the pin high will cause the
device to run normally.
Grounding the learn/LED pin (10) will cause the device to wake from sleep and service either a learn or
erase request: on completion of the function the device will re-enter sleep mode.
Note that while in sleep mode the S0 – S4 and low battery outputs will held high.
Notes to obtain Minimal Current consumption
Sleep/run applications will require close attention to external circuitry in order to minimise the sleep current
and allow a typical circuit draw of 1µA at +5 volts (with/without optional external eeprom).
With reference to the application schematic, the following should be noted;
1. Fit an additional 2.2MΩ resistor from pin 10 to +5 volts.
2. Fit an additional 2.2MΩ resistor from pin 3 to +5 volts.
3. Connect controlling drive to pin 13: high for run and low for sleep.
4. The S0 – S4 and low battery outputs are not asserted during sleep and will have to be sampled by the
controlling micro controller during run mode.
5. The S0 – S4 and low battery LED’s are not required as part of the circuit and can be omitted of
required.
6. Incoming data mark selection on pin 7 MUST be by a resistor (typically 22K) to either +5 or ground
and NOT by a direct connection.
7. The RF/IR data input (pin 9) must be at a valid logic level at all times. In sleep mode, if this input is
allowed to float then significant device current may flow.
DS600-9 Sept ‘04
©2004 Reg. No. 227 4001, ENGLAND
Page 8
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