UM3750 Datasheet – Programmable Encoder / Decoder
UM3750 overview
The UM3750 is a Programmable Encoder / Decoder, supplied in a DIP 18 Pin package. The absolute maximum ratings table on this page lists the 3 limits from the manufacturer's datasheet that must not be exceeded. This page brings together the UM3750 pinout and maximum ratings, with the full datasheet PDF to preview below or download.
The UM3750 Encoder/Decode is a code Transmitter-Receiver system. Working in the transmit (encoder) mode, the will sequentially encode and transmit 12 bits of input. Each of the 12 bits may be 1 or 0 to allow 4096 different codes.In the receive (decoder) mode, the incoming signal is compared to the local code a sequential manner Once an error IS detected the system reset and begin its comparison on the next word. If all 12 bits are received correctly, a “valid” signal is generated. This signal clears a 64ms counter and triggers a 3-stage counter. The 3-stage counter counts the “valid” pluses and when 4 pulses have been detected, the TX/RX output pin goes low. After the TX/RX output pin goes low, the next “valid” must be received within 128ms, giving a one valid in 6 requirement to keep the TX/RX output pin
Datasheet
UM3750 features
- Single chip contains both Encoder and Decoder.
- 3V to 11 V operation.
- On chip oscillator uses non-critical RC components
- Cross interference of is virtually eliminated by circuitry which requires 4 valid words to be received, each within 64ms of the other
- Schmitt Trigger input provides excellent noise immunity.
- Applications. alarm control system, security system cordless telephone, remote control.
- Interfaces with RF, ultrasonic, or infrared modulators I and demodulators
UM3750 pinout
| Name | Description |
|---|---|
| CLR | Clear signal of Comparator |
| ERROR | Error signal from Comparator |
| TIMO | TIMER time-out signal (64ms or 128ms) |
| T/R OUT | Transmit/Receiver output pin |
| INIT | Reset signal of Valid 4 Counter |
| WD | Word detected signal |
| TXO | Transmitter output |
| PXO | Receiver output |
Absolute maximum ratings
| Parameter | Value |
|---|---|
| Power Supply Voltage | _0.3 to 11V |
| Operating Temperature | -20 to Deg C |
| Storage Temperature TSTG | --55 Deg to 150 Deg C |
UM3750 applications
- alarm control system, security system cordless telephone, remote control.
Comments 0
Leave a comment