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
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
† 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/f
osc
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
1
µ
F), 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
Summary of Contents for TMS3637P
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