ADUC814 1.3MIPS 8052 MCU + 8kB Flash + 6-Ch 12-Bit ADC + Dual 12-Bit DAC

The ADUC816 is a complete smart transducer front-end that integrates two high-resolution sigma-delta ADCs, an 8-bit microcontroller unit (MCU), and program/data Flash EEPROM memory on a single chip. This low-power device accepts low-level signals directly from a transducer. The two independent ADCs (Primary and Auxiliary) include a temperature sensor and a programmable gain amplifier (PGA), allowing direct measurement of low-level signals. The ADCs, equipped with on-chip digital filtering, are designed for measuring wide dynamic range, low-frequency signals, suitable for applications such as weigh scales, strain gauges, pressure transducers, or temperature measurements. The ADC output data rates are programmable, and the output resolution varies with the programmed gain and output rate. The device operates from a 32 kHz crystal, with an on-chip phase-locked loop (PLL) generating a high-frequency clock of 12.58 MHz. This clock is routed through a programmable clock divider, which generates the MCU core clock operating frequency. The microcontroller core is based on the 8052 architecture and is compatible with the 8051 instruction set. The microcontroller core machine cycle consists of 12 core clock periods of the selected core operating frequency. The chip provides 8 Kbytes of non-volatile Flash EEPROM program memory, 640 bytes of non-volatile Flash EEPROM data memory, and 256 bytes of RAM, all integrated on-chip. The ADUC816 also features additional analog functionality, including a 12-bit DAC current source, a power supply monitor, and a bandgap reference. On-chip digital peripherals include a watchdog timer, a time interval counter, three timer counters, and two to three serial I/O ports (SPI, UART, and I2C-compatible). The on-chip factory firmware supports in-circuit serial download and debug modes via UART, as well as single-pin emulation mode through the EA pin. The device operates from a single 3 V or 5 V supply, with power dissipation below 10 mW when powered by a 3 V supply. The ADUC816 is housed in a 52-lead MQFP package and is manufactured by Analog Devices, Inc.

The ADUC816 integrates a sophisticated architecture suitable for a wide range of applications requiring precise analog signal processing. The dual ADCs enable simultaneous measurement of multiple signals, enhancing the device's capabilities in applications such as industrial automation, medical instrumentation, and environmental sensing. The inclusion of a temperature sensor allows for temperature compensation in measurements, which is critical in maintaining accuracy in varying environmental conditions.

The programmable gain amplifier (PGA) enhances the device's ability to handle low-level signals, ensuring that even minute changes in input signals can be accurately detected and processed. The on-chip digital filtering further improves the signal integrity by minimizing noise and unwanted artifacts, which is particularly beneficial in low-frequency applications.

The microcontroller's architecture, based on the 8052 core, provides a robust platform for executing complex algorithms and managing peripheral devices. The combination of Flash EEPROM for program storage and RAM for data manipulation allows for flexible application development, enabling users to customize the device's functionality according to specific requirements.

The presence of multiple serial communication interfaces (SPI, UART, I2C) facilitates easy integration with other components in a system, allowing for seamless data exchange and control. The watchdog timer and time interval counter enhance system reliability by providing mechanisms to monitor and manage operational integrity.

The power efficiency of the ADUC816, with low power dissipation at both 3 V and 5 V supply levels, makes it an ideal choice for battery-operated devices where energy conservation is paramount. The compact 52-lead MQFP packaging further simplifies integration into various circuit designs, making the ADUC816 a versatile solution for modern electronic applications.The ADUC816 is a complete smart transducer front-end, inte- grating two high-resolution sigma-delta ADCs an 8-bit MCU, and program/data Flash EE Memory on a single chip. This low power device accepts low-level signals directly from a transducer. The two independent ADCs (Primary and Auxiliary) include a Temperature Sensor and a PGA (allowing direc

t measurement of low-level signals). The ADCs with on-chip digital filtering are intended for the measurement of wide dynamic range, low frequency signals, such as those in weigh scale, strain gauge, pressure transducer, or temperature measurement applications. The ADC output data rates are programmable and the ADC output resolution will vary with the programmed gain and output rate.

The device operates from a 32 kHz crystal with an on-chip PLL generating a high-frequency Clock of 12. 58 MHz. This Clock is, in turn, routed through a programmable Clock divider from which the MCU core Clock operating frequency is generated.

The Microcontroller core is an 8052 and therefore 8051-instruction- set-compatible. The Microcontroller core machine cycle consists of 12 core Clock periods of the selected core operating frequency. 8 Kbytes of nonvolatile Flash EE program memory are provided on-chip. 640 bytes of nonvolatile Flash EE data memory and 256 bytes RAM are also integrated on-chip. The ADUC816 also incorporates additional Analog functionality with a 12-bit DAC current sources, power supply monitor, and a bandgap reference.

On-chip digital peripherals include a watchdog Timer time interval Counter three Timers Counters 2 and three serial I/O ports (SPI, UART and I C-compatible). On-chip factory firmware supports in-circuit serial download and debug modes (via UART), as well as single-pin emulation mode via the EA pin.

A functional block diagram of the ADUC816 is shown above with a more detailed block diagram shown in Figure 12. The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is below 10 mW. The ADUC816 is housed in a 52-lead MQFP package. By Analog Devices, Inc. 🔗 External reference