Add buttons, relays, or sensors to an ESP8266 (which has limited GPIO) without extra analog muxes.
Official datasheets for the HIGHWAY09A are available through several professional electronic databases and distributors: Jotrin Electronics
| DE | RE | D | A – B Output | Receiver (R Pin) | |----|-----|-----|----------------|------------------| | 1 | 0 | 1 | Logic 1 (A > B)| Idle (disabled) | | 1 | 0 | 0 | Logic 0 (A < B)| Idle (disabled) | | 0 | 1 | X | High-Z (tri-state) | Differential A-B > -200mV → R = 1 A-B < -200mV → R = 0 Open/shorted bus → R = 1 (fail-safe) |
: Signal processing and control for automation systems . Functional Features :
| Marking seen | Real part | Function | |--------------|-----------|----------| | HA09A | HA17393A | Dual comparator | | 09A (SOT-23) | Often a 2.5V shunt regulator (TL431 equivalent) | Voltage reference | | A09 (SOT-23) | 2N7002 (MOSFET) or BSS84 | Small-signal MOSFET | | 09A (SOP-8) | LM339A (quad comparator) | Comparator |
When integrating the HIGHWAY09A, engineers should prioritize the following: HIGHWAY09A Holtek | | Xecor
Add buttons, relays, or sensors to an ESP8266 (which has limited GPIO) without extra analog muxes.
Official datasheets for the HIGHWAY09A are available through several professional electronic databases and distributors: Jotrin Electronics highway09a ic datasheet
| DE | RE | D | A – B Output | Receiver (R Pin) | |----|-----|-----|----------------|------------------| | 1 | 0 | 1 | Logic 1 (A > B)| Idle (disabled) | | 1 | 0 | 0 | Logic 0 (A < B)| Idle (disabled) | | 0 | 1 | X | High-Z (tri-state) | Differential A-B > -200mV → R = 1 A-B < -200mV → R = 0 Open/shorted bus → R = 1 (fail-safe) | Add buttons, relays, or sensors to an ESP8266
: Signal processing and control for automation systems . Functional Features : highway09a ic datasheet
| Marking seen | Real part | Function | |--------------|-----------|----------| | HA09A | HA17393A | Dual comparator | | 09A (SOT-23) | Often a 2.5V shunt regulator (TL431 equivalent) | Voltage reference | | A09 (SOT-23) | 2N7002 (MOSFET) or BSS84 | Small-signal MOSFET | | 09A (SOP-8) | LM339A (quad comparator) | Comparator |
When integrating the HIGHWAY09A, engineers should prioritize the following: HIGHWAY09A Holtek | | Xecor