Microchip Technology HCS320/P

The HCS320 creates a 66-bit code word consisting of a 32-bit encrypted hopping portion and a 34-bit fixed portion. It combines a programmable 64-bit encryption key, 28-bit serial number, nonvolatile synchronization information and switch status. Unlike a four-switch-input encoder, this device provides three normal switch inputs plus a SHIFT input to select 16 functions. Its PWM pin supplies encoded data to an external transmitter stage.

LCDChip's original registered package is 8-DIP (0.300", 7.62mm). Microchip's identification table defines /P as an eight-lead plastic DIP with a 300-mil body. Use the controlled package drawing for row spacing, drill diameter and pin-one orientation. The /SN SOIC ordering option is a different footprint.

Layout checks

• Check 300-mil body and through-hole footprint dimensions.
• Verify SHIFT, switch-input and programming-pin routing.
• Route PWM to suitable external RF-transmitter circuitry.

The expected local 8-DIP JPG is absent and the production image returns HTTP 404. Keep this detail unpublished until the correct image is restored and inspected.

Microchip's eight-pin HCS320 table assigns switch inputs S0, S1 and S2 to pins 1, 2 and 3; S2 is also the programming clock. Pin 4 is SHIFT, pin 5 VSS, pin 6 PWM/programming data, pin 7 the LED cathode connection and pin 8 VDD.

Follow the manufacturer's application and programming circuits when sharing pins between operating and programming modes.

Specifications are taken from Microchip HCS320 data sheet DS41097D. The industrial -I/P option has a different temperature rating and must not be substituted by suffix alone.

Other KEELOQ encoders may share code-word length yet differ in switch mapping, SHIFT behavior, programming configuration, receiver learning requirements, temperature range or physical package. Compare the full order code, 300-mil DIP footprint, programmed key and host decoder firmware. No unverified internal alternative is linked.

Microchip Technology's HCS320 KEELOQ Code Hopping Encoder data sheet DS41097D provides the feature list, eight-pin table, EEPROM and code-word descriptions, and product identification table that defines the /P package and commercial-temperature range.

Check top marking, traceability, 300-mil DIP dimensions and pin-one orientation. Validate device provisioning and transmitter-to-receiver learning using authorized test fixtures. Confirm SHIFT input behavior, code-word decoding and supply operation in the intended system.

Safeguard manufacturer-code secrets and crypt-key provisioning records. Validate receiver learning, synchronization, SHIFT mapping, the RF transmitter stage and the controlled DIP footprint. Restore and inspect the live package JPG before formal publication.