S5G9801X01/S5G9803X01

INFRAED REMOCON RECEIVER

6

OPERATING PRINCIPLES

1. POR (Power On Reset) CIRCUIT

To initialize the internal state at time of power ON, it is necessary to perform the initialization.

The initialization is carried out when a capacitor is connected to the code bit terminal.

Figure 3.

In the case of S5G9803, connect a capacitor to CODE2 and CODE3.

2. OSCILLATION CIRCUIT

The RC oscillation circuit is normally operated at 38kHz oscillation frequency.

(The RC is connected between OSC terminal and VSS.)

Figure 4.

Oscillation frequency is about 38kHz ± 5kHz at R = 38kW and C = 1000pF.

R

UP

R

UP

CODE1

CODE2

Initialize

RUP = 20k

Ω

C = 0.001

µF − 0.022µF

CSC

SCHMITT

FOSC

R

C

R = 39k

Ω ± 5%

C = 1000pF

± 5%