TMS3637 datasheet(29/53 Pages) TI

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5–11

Table 5–6. Transmitter/Receiver Compatibility†

ANALOG

NORMAL

VTR

ANALOG

NORMAL

TRAIN

ANALOG

NORMAL

Q-STATE

MODULATED

VTR

MODULATED

TRAIN

MODULATED

Q-STATE

LOGIC

NORMAL

VTR

LOGIC

NORMAL

TRAIN

LOGIC

NORMAL

Q-STATE

XMITTER

RCVR

Normal

Continuous

Normal

Triggered

Normal

Periodic

Modulated

Continuous

Modulated

Triggered

Modulated

Periodic

Code Train

Normal

Triggered

Code Train

Normal

Periodic

Code Train

Modulated

Triggered

Code Train

Modulated

Periodic

XXX

† X denotes compatible transmitter/receiver combinations.

5.11.1

Valid Transmission Receiver (CG = 1, CH = 0)

When the TMS3637 is configured as a receiver (CA = CC = 0) and the configuration bits CG = 1 and

CH = 0, the device is configured as a valid transmission receiver. Bits CB, CF, and CI must also be set to

specify modulated or normal modes, analog or logic (for normal mode only), and noninverting or inverting

format of the output code. Other receiver modes are discussed in Section 5.12.

In the valid transmission receiver (VTR) configuration, an external pullup resistor is connected to TIME.

When the TMS3637 recognizes the received code as correct, it produces a high pulse (VTR pulse) on OUT.

The VTR output pulse duration is equal to 48 times the pulse duration of the received data and is produced

after a delay time equal to 152

× 2/fosc from the end of the received code. If a capacitor is added in parallel

to the pullup resistor on TIME, the VTR pulse duration on the output terminal can be increased according

to a quantity determined by the time constant of RC. By choosing a large capacitor value (no greater than

µF), it is possible to have a VTR output pulse duration of up to several seconds. When the VTR duration

is longer than the repetition period of received codes, the VTR has a duration as long as that of the correct

received code.

5.11.2

Train Receiver (CG = 1, CH = 1, CD, CE)

When the TMS3637 is configured as a receiver (CA = CC = 0) and EEPROM bits CG and CH are both set

to 1, the device is configured as a train receiver. Bits CB, CF, and CI must also be set to specify modulated

or normal modes, analog or logic (for normal mode only), and noninverting or inverting format.

In the train-receiver configuration, the device outputs a VTR pulse on OUT only after the reception of two,

four, or eight received codes that occur within one period of the train code counter oscillator. This feature

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