PIC16C622-20E/SO - 8-bit OTP MCU, 3.5KB, 13 I/O | Microchip
MPN: PIC16C622-20E/SO β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.8 | $5.80 |
| 10 | $5.22 | $52.20 |
| 100 | $4.64 | $464.00 |
| 500 | $4.06 | $2,030.00 |
| 1,000 | $3.48 | $3,480.00 |
PIC16C622-20E/SO Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripheral I/O, and clock generation on one die. The PIC16C family uses Microchip's 14-bit instruction set with a Harvard architecture, separating program and data buses for deterministic single-cycle instruction execution. This makes the PIC16C622 part of the broader hierarchy: microcontroller -> embedded controller -> semiconductor -> integrated circuit.
Key features include 13 I/O pins with individual direction control, an 8-bit timer/counter with 8-bit prescaler, a watchdog timer with on-chip RC oscillator, a 5-channel 8-bit analog-to-digital converter (ADC), two analog comparators with programmable reference, and an internal 4MHz RC oscillator for low-cost designs without an external crystal. The 20MHz maximum clock rate supports time-critical control loops, while OTP program memory enables fast prototyping before committing to a masked ROM variant.
Architecturally, the PIC16C622 uses CMOS EPROM technology with a 14-bit instruction word. Its 35 single-word instructions, 8-level hardware stack, and direct/indirect data addressing simplify assembly-language programming. The integrated brown-out design with secondary oscillator and dual analog comparators make it well suited for mixed-signal embedded designs.
Typical applications include automotive body controllers, white-goods appliance control, security and fire-alarm sensor interfaces, simple motor control loops, and industrial instrumentation front-ends. The extended (E) temperature grade qualifies it for underhood and dashboard automotive environments.
When designing with this OTP part, plan firmware before programming because OTP parts cannot be reprogrammed in-circuit. Ensure the decoupling network (100nF plus 10uF bulk) sits within 5mm of VDD/VSS pins, and reserve MCLR with the proper external pull-up configuration.
This page synthesizes verified distributor stock, parametric alternatives, and application-specific design notes that are not available in the manufacturer datasheet alone - enabling faster component evaluation and BOM risk reduction.
Drop-in alternatives for PIC16C622-20E/SO β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16C622-20E/SO (same form factor and footprint) β differing in EEPROM Size, Package, Timers, Mounting Type, Program Memory Size.
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Request AlternativesPIC16C622-20E/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC (Harvard) |
| Instruction Set Width | 14-bit |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 bytes |
| EEPROM Size | None (OTP only) |
| I/O Pins | 13 |
| Maximum Clock Frequency | 20 MHz |
| Supply Voltage | 3.0 V to 5.5 V |
| ADC | 8-bit, 5 channels |
| Analog Comparators | 2 |
| Timers | 1 x 8-bit with 8-bit prescaler |
| Watchdog Timer | Yes (on-chip RC oscillator) |
| Brown-out Reset | Yes |
| Internal RC Oscillator | Yes (~4 MHz) |
| Operating Temperature | -40 C to +125 C (Automotive / Extended) |
| Package | 18-SOIC (0.295" / 7.50 mm body width) |
| Mounting Type | Surface Mount (Gull Wing) |
PIC16C622-20E/SO Pin Configuration
| Pin 1 | RA2/AN2/VREF β Bidirectional I/O / analog channel 2 / ADC voltage reference |
| Pin 2 | RA3/AN3 β Bidirectional I/O / analog channel 3 |
| Pin 3 | RA4/T0CKI β Bidirectional I/O (open-drain) / Timer0 clock input |
| Pin 4 | RA5/MCLR/VPP β Bidirectional I/O / master clear (reset) / programming voltage |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0/INT β Bidirectional I/O / external interrupt input |
| Pin 7 | RB1 β Bidirectional I/O |
| Pin 8 | RB2 β Bidirectional I/O |
| Pin 9 | RB3 β Bidirectional I/O |
| Pin 10 | RB4 β Bidirectional I/O |
| Pin 11 | RB5 β Bidirectional I/O |
| Pin 12 | RB6 β Bidirectional I/O |
| Pin 13 | RB7 β Bidirectional I/O |
| Pin 14 | VDD β Positive supply voltage (3.0V to 5.5V) |
| Pin 15 | OSC2/CLKOUT β Crystal output / clock output (RC mode) |
| Pin 16 | OSC1/CLKIN β Crystal input / external clock input |
| Pin 17 | RA0/AN0 β Bidirectional I/O / analog channel 0 |
| Pin 18 | RA1/AN1 β Bidirectional I/O / analog channel 1 |
Typical Applications
PIC16C622-20E/SO is suitable for 6 applications: Automotive Body Controllers, Appliance Control (White Goods), Security and Fire-Alarm Sensor Interfaces, Simple Motor Speed Control Loops, Industrial Instrumentation Front-Ends, LED Lighting Controllers.
Automotive Body Controllers
The PIC16C622-20E/SO fits automotive body controller modules thanks to its qualified -40C to +125C extended temperature grade, 5-channel 8-bit ADC for reading sensor inputs (temperature, position, current), and 2 on-chip analog comparators for window-detection on analog signals. At 20 MHz it provides 5 MIPS of processing headroom for CAN-LIN slave bridges and lighting/HVAC control logic. The 18-SOIC package suits the confined PCB footprint of body modules behind the dashboard, and the OTP memory protects firmware from accidental over-write during service. The watchdog timer with on-chip RC oscillator provides the autonomous reset behavior required by automotive functional-safety guidelines.
Recommended
Appliance Control (White Goods)
Washing machines, dishwashers, and induction cooktops benefit from the PIC16C622-20E/SO's combination of 5 ADC inputs (for keypad scanning and sensor readout), 2 comparators (for zero-crossing detection and motor overcurrent sensing), and 13 I/O for relay/triac drivers and LED indicators. Its 20 MHz clock supports software PWM generation for fan/motor speed control, while the brown-out reset protects against brown-out glitches common on AC mains dropout. The automotive E temperature grade allows installation near heat-generating elements such as compressor housings.
Recommended
Security and Fire-Alarm Sensor Interfaces
PIR motion sensors, smoke detectors, and glass-break detectors use the PIC16C622-20E/SO to digitize analog signals from a pyroelectric or photoelectric transducer and apply digital filtering before reporting to a host. The internal RC oscillator eliminates the need for an external crystal, reducing BOM cost for volume-deployed disposable detectors. The watchdog timer ensures the alarm logic recovers from firmware lockup, and the low-power sleep modes (microamp range) extend battery life on wireless sensor nodes. The 18-SOIC package supports compact PCB integration into the sensor can.
Recommended
Simple Motor Speed Control Loops
DC brush motors in HVAC fans, small pumps, and conveyor drives use the PIC16C622-20E/SO to read back-EMF or current shunt signals via the on-chip 8-bit ADC and adjust PWM duty via software for closed-loop speed regulation. The two on-chip comparators enable hardware overcurrent and overvoltage protection independent of firmware execution. The 20 MHz clock rate supports the 10 kHz+ PWM frequencies required to keep motor whine outside the audible band, and the extended temperature grade ensures reliable operation near motor heat sources.
Recommended
Industrial Instrumentation Front-Ends
Process transmitters, panel meters, and data loggers use the PIC16C622-20E/SO to digitize 4-20 mA loops, thermocouple or RTD signals via the 8-bit ADC, and drive character LCDs or 7-segment displays through the 13 I/O pins. The extended -40C to +125C temperature grade supports outdoor and factory-floor deployment, while brown-out reset keeps the device in a known state across industrial mains transients. OTP memory ensures the calibration data and firmware cannot be tampered with in service.
Recommended
LED Lighting Controllers
Architectural and automotive LED drivers use the PIC16C622-20E/SO to generate multi-channel PWM dimming signals and execute DMX or DALI protocol stacks. The 13 I/O pins support up to 6 high-current PWM channels (using complementary outputs) while the ADC monitors LED string current for constant-current feedback. The internal 4 MHz RC oscillator eliminates an external crystal, reducing the BOM cost for high-volume lighting fixtures, and the wide 3.0-5.5V supply allows direct 3.3V or 5V power-rail operation.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C622-20E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C622-20I/SO | PIC16C622T-20E/SO | PIC16C621A-20E/SO | PIC16F72-I/SO | PIC16F716-I/SO |
|---|---|---|---|---|---|---|
| Package | 18-SOIC (7.50 mm) | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP EPROM 3.5 KB | OTP EPROM 3.5 KB | OTP EPROM 3.5 KB | OTP EPROM 2 KB | Flash 2 KB | Flash 3.5 KB |
| Operating Temperature | -40 C to +125 C | -40 C to +85 C | -40 C to +125 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| ADC | 8-bit, 5 channels | 8-bit, 5 channels | 8-bit, 5 channels | 8-bit, 5 channels | 8-bit, 5 channels | 8-bit, 5 channels |
| Reprogrammable | No (OTP) | No (OTP) | No (OTP) | No (OTP) | Yes (Flash) | Yes (Flash) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active | Active |
Key Differentiators
- Automotive -40C to +125C extended temperature grade with 3.5 KB program memory (vs PIC16C622-20I/SO)
- 3.5 KB OTP program memory - larger than PIC16C621A family (vs PIC16C621A-20E/SO)
- OTP one-time programming protects production firmware from field tampering (vs PIC16F72-I/SO)
- Two analog comparators and 5-channel 8-bit ADC in a 18-SOIC package (vs PIC16C620A-20E/SO)
Design Notes
Decouple VDD (Pin 14) with a 100nF ceramic capacitor placed within 5 mm of the package and a 10uF bulk capacitor (tantalum or aluminum polymer) on the same node. The PIC16C622 draws brief current spikes on each internal clock edge; inadequate bulk capacitance causes VDD droop and unexpected brown-out resets. For battery-powered designs, place the bulk cap adjacent to VDD before the trace branches to other loads.
PIC16C622-20E/SO is OTP and CANNOT be reprogrammed or erased. Once a unit is programmed with a faulty firmware image it must be discarded; budget for 5-10% prototyping loss. For development, use the windowed CERDIP PIC16C622 device (PIC16C622/JW) or the flash-based PIC16F72-I/SO on the same 18-SOIC footprint. Verify the configuration bits (oscillator, watchdog, brown-out, code-protect) BEFORE programming because OTP programming is irreversible.
Keep the MCLR/VPP pin (Pin 5) above 0.8 VDD for reliable operation; tie it to VDD through a 10 kohm resistor and a 100nF cap to ground for hardware-noise immunity. The OSC1/OSC2 traces should be as short as possible and surrounded by a ground guard ring in crystal mode. For automotive PCB designs, place the part at least 10 mm away from inductive loads to reduce EMI susceptibility through the analog comparators.
Estimated: at VDD=5V, fOSC=20MHz, and all 13 I/O pins sourcing 20 mA DC, internal power dissipation is approximately 75 mW. The 18-SOIC package has theta_JA around 75 C/W in still air, giving a junction temperature rise of only 5.6 C above ambient. However, for automotive applications near +85 C ambient the E temperature grade ensures 40 C of thermal headroom - no heatsink or copper pour is required for the MCU itself.
Compliance Information
RoHS/lead-free status not specified in Verified Web Data; Trustcompo listing claims RoHS-compliant/lead-free/green but the datasheet ordering code does not include a G suffix, indicating likely matte-tin finish and E-grade temperature rating. AEC-Q100 not qualified - the E suffix denotes extended operating temperature, not formal automotive qualification.
