TMS3637 datasheet(39/53 Pages) TI

39 / 53 page

6–7

Table 6–4. Infrared Receiver Component Functions (Normal Transmission Mode)

DEVICE

FUNCTION

TMS3637 configured as a logic normal (1-code) Q-state inverting receiver

Current-limiting resistor for IR transistor Q1

Base-bias resistor for Q1

Collector current-limiting resistor for Q2

Collector current-limiting resistor for Q3

Emitter current-limiter for Q3

Resistor on TIME that, in conjunction with C3, determines OUT pulse duration on U1.

Resistor on OSCR that, in conjunction with C4, determines internal oscillator frequency of U1.

Current-limiting resistor for LED indicator

AC-coupling capacitor that passes fluctuating voltage from phototransistor Q1

Power-supply bypass capacitor

Capacitor on TIME that, in conjunction with R6, determines OUT pulse duration on U1.

Capacitor on OSCC that, in conjunction with R7, determines the internal oscillator frequency of U1.

Capacitor that determines the gain of the internal analog receive amplifier on U1.

LED indicator that toggles on/off when valid code is received

100 k

Ω

OSCR

OSCC

TIME

GND

47 pF

VCC

CEX

OUT

U2 (receiver)

1 M

Ω

470 nF

330

Ω

VCC

OUT

10 k

Ω

100 k

Ω

µF

330

Ω

100 k

Ω

0.1

µF

2.7 k

Ω

2N2222

NPN IR

Phototransistor

Figure 6–5. Infrared Receiver

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