PIC18F4585-H/P - 48KB Flash 8-bit MCU ECAN DIP-40 | Microchip
MPN: PIC18F4585-H/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.28 | $8.28 |
| 10 | $7.62 | $76.20 |
| 100 | $6.93 | $693.00 |
| 500 | $6.21 | $3,105.00 |
| 1,000 | $5.55 | $5,550.00 |
PIC18F4585-H/P Overview
Key features include 48 KB Flash, 3,328 bytes RAM, 1,024 bytes of data EEPROM, 36 digital I/O pins, two 8-bit and three 16-bit timers, two analog comparators, an Enhanced USART, MSSP (SPI/I2C), and an Enhanced CAN 2.0B module supporting both standard and extended identifiers. The nanoWatt technology offers multiple power-managed modes (Run, Idle, Sleep) with on-the-fly clock switching between primary oscillator and Timer1, enabling ultra-low standby current for always-on industrial sensors. The 10-bit ADC supports up to 11 input channels with automatic acquisition and conversion.
Typical applications include automotive body and chassis networks, HVAC and instrument clusters, industrial CAN nodes, building automation gateways, motor control boards, and embedded sensor hubs. The ECAN module handles 1 Mbps bus traffic with hardware acceptance filters and multiple transmit/receive buffers, offloading the CPU in time-critical CAN applications. Combined with 48 KB of self-programmable Flash and 1 KB of EEPROM, the part supports in-application firmware upgrades across industrial temperature windows.
When designing with the PIC18F4585-H/P, observe that the high-temperature H-grade device is intended for under-hood and harsh-environment deployments; verify the -H suffix on the order code when sourcing for automotive AEC-Q100 designs. The DIP-40 footprint is socket-compatible with the I/P and E/P grades, allowing PCB reuse across temperature grades during prototyping. Use MPLAB X IDE with the MPLAB ICD 5 or PICkit 5 for development; the device uses the standard PIC18 40-pin ICSP programming interface.
Drop-in alternatives for PIC18F4585-H/P — 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 PIC18F4585-H/P (same form factor and footprint) — differing in Package, Operating Temperature, Timers, ADC, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4585-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4585-E/P
✅ Drop-In✓ In Stock
$5.07 / Unit
View Datasheet →PIC18F4685-I/P
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC18F4585-H/ML
✅ Drop-In✓ In Stock
$7.85 / Unit
View Datasheet →PIC18F4580-I/P
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC18F448-I/P
✅ Drop-In✓ In Stock
$4.42 / Unit
View Datasheet →PIC18F458-I/P
✅ Drop-In✓ In Stock
$7.45 / Unit
View Datasheet →PIC18F4585-H/P Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC |
| Program Memory (Flash) | 48 KB (24K x 16) |
| RAM | 3,328 bytes |
| Data EEPROM | 1,024 bytes |
| Maximum CPU Speed | 25 MHz (10 MIPS) |
| Operating Voltage (Vdd) | 2.0 V to 5.5 V |
| Operating Temperature | -40C to +150C (H grade) |
| Number of I/O Pins | 36 |
| Package | 40-pin PDIP (DIP-40, 0.600"/15.24 mm) |
| ADC | 10-bit, up to 11 channels |
| Communication Interfaces | ECAN 2.0B, Enhanced USART, MSSP (SPI/I2C) |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Analog Comparators | 2 |
| Power-Saving Modes | nanoWatt (Run / Idle / Sleep with on-the-fly clock switching) |
| Mounting Type | Through-Hole (PDIP) |
| Programming Interface | ICSP (In-Circuit Serial Programming) via MPLAB ICD 5 / PICkit 5 |
PIC18F4585-H/P Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear (reset) input / digital I/O RE3 |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/Vref- — PORTA bit 2 / analog input 2 / ADC Vref- |
| Pin 5 | RA3/AN3/Vref+ — PORTA bit 3 / analog input 3 / ADC Vref+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| Pin 8 | OSC1/RA7 — Oscillator input / PORTA bit 7 |
| Pin 9 | OSC2/RA6 — Oscillator output / PORTA bit 6 |
| Pin 10 | RC0/T1OSO — PORTC bit 0 / Timer1 oscillator output |
| Pin 11 | Vdd — Positive supply voltage |
| Pin 12 | Vss — Ground |
| Pin 13 | RC1/T1OSI — PORTC bit 1 / Timer1 oscillator input |
| Pin 14 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Pin 15 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 16 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 17 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 18 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pin 19 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 20 | Vss — Ground |
| Pin 21 | Vdd — Positive supply voltage |
| Pin 22 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 23 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 24 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 25 | RB3/CANRX — PORTB bit 3 / ECAN receive pin |
| Pin 26 | RB4/CANTX — PORTB bit 4 / ECAN transmit pin |
| Pin 27 | RB5/PGM — PORTB bit 5 / ICSP programming |
| Pin 28 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 29 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 30 | Vss — Ground |
| Pin 31 | Vdd — Positive supply voltage |
| Pin 32 | RD0/PSP0 — PORTD bit 0 / parallel slave port 0 |
| Pin 33 | RD1/PSP1 — PORTD bit 1 / parallel slave port 1 |
| Pin 34 | RD2/PSP2 — PORTD bit 2 / parallel slave port 2 |
| Pin 35 | RD3/PSP3 — PORTD bit 3 / parallel slave port 3 |
| Pin 36 | RD4/PSP4 — PORTD bit 4 / parallel slave port 4 |
| Pin 37 | RD5/PSP5 — PORTD bit 5 / parallel slave port 5 |
| Pin 38 | RD6/PSP6 — PORTD bit 6 / parallel slave port 6 |
| Pin 39 | RD7/PSP7 — PORTD bit 7 / parallel slave port 7 |
| Pin 40 | RE0/RD/AN5 — PORTE bit 0 / read strobe / analog input 5 |
| Pin 41 | RE1/WR/AN6 — PORTE bit 1 / write strobe / analog input 6 |
| Pin 42 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
Typical Applications
PIC18F4585-H/P is suitable for 7 applications: Automotive CAN Bus Nodes, Industrial Sensor Hubs, HVAC Control Boards, Instrument Clusters and Driver Displays, Building Automation Gateways, Motor Control Boards (BLDC / Stepper), Embedded Sensor Data Loggers.
Automotive CAN Bus Nodes
The PIC18F4585-H/P's integrated ECAN 2.0B controller, 48KB self-programmable Flash, and -40C to +150C operating range make it ideal for automotive body and chassis ECUs communicating on CAN bus. The hardware acceptance filters and dual transmit buffers offload bus arbitration from the CPU, while nanoWatt power modes let the node enter sub-microamp sleep between CAN wake-up frames. In practice the MCU runs at 25 MHz (10 MIPS), reads CAN messages in hardware buffers, and processes them before re-entering sleep. Compared with a discrete CAN controller, the integrated ECAN removes a chip from the BOM and saves both PCB area and quiescent current in always-on automotive gateways.
Recommended
Industrial Sensor Hubs
With 36 digital I/O, an 11-channel 10-bit ADC, two analog comparators, and three 16-bit timers, the PIC18F4585-H/P is well suited for industrial multi-sensor aggregation nodes that read temperature, pressure, flow, and digital inputs before transmitting aggregates over CAN or RS-485. The 48KB Flash holds MODBUS or CANopen stack images plus application firmware, and 1KB of EEPROM stores calibration data with byte-level endurance. Industrial -40C to +150C operation supports unshielded cabinet mounting. The nanoWatt sleep mode drops current under 1 uA, enabling battery-powered wireless sensor transmitters that wake periodically for measurements.
Recommended
HVAC Control Boards
The PIC18F4585-H/P is a proven HVAC controller brain: its 11-channel ADC reads mixed temperature and pressure sensors, the three 16-bit timers drive triac-based phase-angle control for fans and compressors, and the ECAN module links the unit to a building automation backbone. The -H grade supports rooftop and boiler-room ambient extremes to +150C when paired with conformal coating. With 48KB Flash, a full BACnet or Modbus stack plus custom zoning logic fits in a single chip, and the 10 MIPS throughput keeps control loops well under 10 ms.
Recommended
Instrument Clusters and Driver Displays
Automotive instrument clusters benefit from the PIC18F4585-H/P's CAN connectivity, 10-bit ADC for fuel/temperature gauges, PWM outputs for backlight dimming, and -40C to +150C operating window for under-dash mounting. The 48KB Flash supports gauge graphics libraries and CAN J1939 stacks. Multiple analog comparators enable direct tachometer signal conditioning without an external op-amp, and the Enhanced USART drives LIN or K-Line diagnostics. The H-grade device survives engine-bay heat soak during off-state parking.
Recommended
Building Automation Gateways
The PIC18F4585-H/P serves as a low-cost BACnet MS/TP or CANopen gateway between field devices and a building management system. Its ECAN 2.0B controller and Enhanced USART support dual-protocol bridging, while 48KB Flash accommodates full BACnet stack and routing tables. The nanoWatt sleep mode enables 24/7 always-on operation at low energy cost. With 1KB EEPROM, gateway configuration survives power cycles without external NVM.
Recommended
Motor Control Boards (BLDC / Stepper)
The PIC18F4585-H/P's three 16-bit timers with PWM, four hardware capture/compare channels, two analog comparators, and 25 MHz throughput support sensorless or Hall-sensor BLDC and stepper motor control loops. The ECAN module integrates the drive into a networked motion system, and the -H grade tolerates the elevated temperatures inside sealed motor housings. With 48KB Flash, application code can include FOC or trapezoidal commutation algorithms, fault handling, and CANopen DS402 motion profile without external memory.
Recommended
Embedded Sensor Data Loggers
The PIC18F4585-H/P's 48KB Flash holds data-acquisition firmware, 3,328 bytes RAM buffers multi-sample averaging, and 1KB EEPROM stores hours of metadata or calibration. The 11-channel ADC at 25 MHz CPU captures analog sensors up to 50 ksps aggregate, while the MSSP interface logs to external serial EEPROM or SD cards. nanoWatt sleep mode drops current to nanoamp levels between samples, making the part suited for battery-powered remote loggers in industrial or environmental monitoring.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F4585-H/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4585-I/P | PIC18F4585-E/P | PIC18F4685-I/P | PIC18F4580-I/P | PIC18F458-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP (DIP-40) | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same | 40-pin PDIP (DIP-40) - same |
| Program Memory | 48 KB | 48 KB | 48 KB | 96 KB | 32 KB | 32 KB |
| Operating Temperature | -40C to +150C (H grade) | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C |
| ECAN Module | Yes (ECAN 2.0B) | Yes | Yes | Yes | No | Yes |
| CPU Speed | 25 MHz (10 MIPS) | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 25 MHz |
| RAM | 3,328 bytes | 3,328 bytes | 3,328 bytes | 3,328 bytes | 1,536 bytes | 1,536 bytes |
| Data EEPROM | 1,024 bytes | 1,024 bytes | 1,024 bytes | 1,024 bytes | 256 bytes | 256 bytes |
| ADC | 10-bit, 11 channels | 10-bit, 11 channels | 10-bit, 11 channels | 10-bit, 11 channels | 10-bit, 11 channels | 10-bit, 8 channels |
| Unit Price (qty 1, USD) | 8.28 | ~7.10 | ~7.50 | ~9.20 | ~6.80 | ~7.40 |
Key Differentiators
- Highest operating temperature in the PIC18F4585 family (vs PIC18F4585-I/P)
- Doubles Flash for future-proof designs (vs PIC18F4685-I/P)
- Lower cost for non-ECAN designs (vs PIC18F4580-I/P)
Design Notes
Estimated: at 25 MHz and 5V supply with all peripherals active, the PIC18F4585-H/P draws approximately 30 mA, dissipating 150 mW - well within the 1 W PDIP-40 rating without active cooling. At +150C ambient with 1W dissipation the die temperature approaches the +175C junction limit; for high-temperature H-grade applications verify junction-to-ambient thermal resistance (theta_JA) of approximately 70 C/W for PDIP-40 and reduce clock or use sleep modes to maintain margin.
Place two Vdd/Vss decoupling pairs close to pins 11/12 and 31/32 of the DIP-40 package: a 100 nF ceramic plus a 10 uF bulk tantalum for each pair. Add a 10 kohm pull-up on MCLR (pin 1) and a 100 nF cap on the MCLR line to prevent spurious resets. For ECAN designs, keep the CANTX (RB4) and CANRX (RB3) traces short and route a single ground plane under the ICSP header to minimize EMI.
Critical: the ECAN module requires configuration of the CANCON register bits to enter Configuration mode before modifying BRGCON1/2/3 for baud rate. Failing to do so silently writes are ignored. Also note that the -H grade has only 1KB of EEPROM, not 4KB - some legacy code referencing 4KB will read garbage. Always select the correct configuration bits for the ECAN module in the MPLAB X IDE before generating HEX files.
The ECAN CANTX and CANRX lines must go through an external transceiver (e.g. MCP2551) - they are 5V CMOS logic and cannot directly drive a CAN bus. Place the transceiver within 50 mm of the MCU; keep CANH and CANL traces parallel and length-matched within 10 mm. Add a 120 ohm termination resistor at each end of the bus, never in the middle. For EMI-sensitive environments add a common-mode choke between the transceiver and bus connector.
Compliance Information
RoHS and lead-free per Microchip product page. H-grade -40C to +150C operating range is not an AEC-Q100 certification; consult Microchip automotive product line for AEC-Q100 qualified PIC18 ECAN parts. Halogen-free status not explicitly stated in retrieved data.
