RF / IR Encoder / Decoder Chipset

RF600E

RF Evaluation Boards,

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 1

µA (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 1

µA at +5 volts (with/without optional external eeprom).

With reference to the application schematic, the following should be noted;

1.

Fit an additional 2.2M

Ω resistor from pin 10 to +5 volts.

2.

Fit an additional 2.2M

Ω 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

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