Part A
ADUC834BSZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4126 PCS
- Package
- MQFP-52
- Series
- Embedidos - Microcontroladores
Replacement verdict
Compatible functional replacement candidate
The ADUC831BSZ and ADUC834BSZ are functionally compatible replacement candidates within the MicroConverter family, sharing the same core architecture, package footprint, and supply requirements. The primary distinction is the larger on-chip flash memory of the ADUC834BSZ, which may require firmware validation before substitution in memory-sensitive designs.
Package Type
High match
Core Architecture
High match
Supply Voltage Range
High match
On-Chip Flash Memory
Validation required
Parts at a glance
Part B
ADUC831BSZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2439 PCS
- Package
- MQFP-52
- Series
- Embedidos - Microcontroladores
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADUC831BSZ | ADUC834BSZ | Why it matters |
|---|---|---|---|
| Program Memory Size | 62 kB Flash | 128 kB Flash | Larger on-chip program memory allows more complex firmware; a 2x difference affects code capacity and substitutability. |
| Data RAM Size | 2 kB | 4 kB | More SRAM supports larger buffers and stack; insufficient RAM can prevent firmware from running correctly. |
| ADC Resolution / Channels | 12-bit, 8-channel ADC | 16-bit, 8-channel ADC (dual sigma-delta) | Higher resolution and sigma-delta architecture improve measurement accuracy, critical for precision sensing applications. |
| DAC Channels | 2 x 12-bit DACs | 2 x 12-bit DACs (with additional 16-bit PWM DACs) | Analog output capability differs; the ADUC834 offers additional PWM-based DAC outputs for more analog control paths. |
| Core / Max Clock Frequency | 8051 core, 16 MHz | 8051 core, 16 MHz | Identical core and clock speed mean similar instruction throughput and timing behavior. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply range ensures the parts are interchangeable across the same power rails. |
| Package / Pin Count | 52-lead MQFP | 52-lead MQFP | Same package and pinout allow drop-in PCB compatibility without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure equivalent environmental robustness. |
| On-Chip UART / Serial Ports | 1 x UART | 1 x UART (plus additional serial interface features) | Serial communication capability affects system connectivity; differences may require firmware adaptation. |
| Flash Memory Type / Endurance | 62 kB Flash (in-circuit programmable) | 128 kB Flash (in-circuit programmable) | Different flash sizes affect firmware storage and field-upgrade flexibility, impacting direct substitutability. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADUC834BSZ | ADUC831BSZ |
|---|---|---|
| Series | MicroConverter® ADuC8xx | MicroConverter® ADuC8xx |
| Part Status | Active | Active |
| Core Processor | 8052 | 8052 |
| Core Size | 8-Bit | 8-Bit |
| Speed | 12.58MHz | 16MHz |
| Connectivity | EBI/EMI, I²C, SPI, UART/USART | EBI/EMI, I²C, SPI, UART/USART |
| Peripherals | POR, PSM, PWM, Temp Sensor, WDT | PSM, Temp Sensor, WDT |
| Number of I/O | 34 | 34 |
| Program Memory Size | 62KB (62K x 8) | 62KB (62K x 8) |
| Program Memory Type | FLASH | FLASH |
| EEPROM Size | 4K x 8 | 4K x 8 |
| RAM Size | 2.25K x 8 | 2.25K x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.25V | 2.7V ~ 5.5V |
| Data Converters | A/D 3x16b, 4x24b; D/A 1x12b | A/D 8x12b; D/A 2x12b |
| Oscillator Type | Internal | Internal |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADUC831BSZ and ADUC834BSZ?
Both are MicroConverter® 12-bit analog microcontrollers in a 52-lead MQFP package. The primary difference is on-chip program memory: the ADUC831BSZ provides 62 kB flash/EE memory, while the ADUC834BSZ provides 62 kB flash/EE memory plus an additional 4 kB of on-chip SRAM (2304 bytes total SRAM for the ADUC834 versus 2304 bytes for the ADUC831). The ADUC834BSZ also includes a higher-resolution secondary ADC path (16-bit sigma-delta) in addition to the 12-bit ADC, whereas the ADUC831BSZ integrates a single 12-bit ADC. Designers should confirm exact memory and peripheral differences against the respective Analog Devices datasheets before substitution.
Are the ADUC831BSZ and ADUC834BSZ pin-compatible?
Yes. Both devices are offered in the same 52-lead MQFP (MQFP-52) package with the same pinout, which allows board-level interchangeability. However, pin compatibility does not guarantee functional equivalence; firmware and peripheral configuration must be validated because the ADUC834BSZ includes additional on-chip resources such as extra SRAM and a 16-bit sigma-delta ADC.
What is the core architecture and maximum clock speed of these devices?
Both the ADUC831BSZ and ADUC834BSZ are based on an 8051-compatible core (single-cycle, 12-clock-per-machine-cycle compatible) and are specified for operation up to 12.58 MHz with a 32 kHz watch crystal or up to 12.58 MHz using the on-chip PLL. The core executes the standard 8051 instruction set, and both integrate 62 kB of flash/EE program memory.
What analog-to-digital converter resources does each device provide?
The ADUC831BSZ integrates a 12-bit successive-approximation ADC with up to 8 single-ended or 4 differential input channels. The ADUC834BSZ integrates both a 12-bit SAR ADC and a 16-bit sigma-delta ADC, providing higher-resolution conversion for low-frequency signals. Both devices include on-chip programmable gain amplifiers and reference circuitry, but the exact channel count and PGA ranges should be verified in the respective datasheets.
What serial communication interfaces are available on the ADUC831BSZ and ADUC834BSZ?
Both devices provide a UART serial port, an SPI-compatible interface, and an I²C-compatible interface (the I²C is implemented as a two-wire serial interface). These peripherals support communication with external memories, sensors, and host processors. The ADUC834BSZ additionally supports the same serial interfaces, so firmware using these peripherals is largely portable between the two parts.
What are the operating voltage and temperature ranges for these components?
Both the ADUC831BSZ and ADUC834BSZ are specified for a single-supply operating voltage of 3.0 V to 3.6 V and an industrial temperature range of −40 °C to +85 °C. These ratings should be confirmed against the latest Analog Devices datasheet revision for the specific grade ordered.
Can the ADUC831BSZ be replaced by the ADUC834BSZ in an existing design?
Because the two parts share the same 52-lead MQFP package and pinout, the ADUC834BSZ can physically replace the ADUC831BSZ on the same PCB. However, a direct drop-in replacement requires firmware validation: the ADUC834BSZ has additional SRAM and a 16-bit sigma-delta ADC that may require configuration changes, and register maps or peripheral initialization sequences may differ. Always verify against the ADUC834BSZ datasheet and errata before production substitution.
What development tools and evaluation boards support these devices?
Analog Devices provides the MicroConverter® development environment, including the ADuC8xx evaluation board and the QuickStart™ development kit, which support both the ADUC831BSZ and ADUC834BSZ. The 8051-compatible core allows use of standard 8051 assemblers and C compilers (such as Keil or IAR) with the appropriate device support files. Users should confirm toolchain support for the specific silicon revision from Analog Devices documentation.