ADUC816 MicroConverter®, Dual-Channel 16-Bit ADCs with Embedded Flash MCU

The ADuC816 is a complete smart transducer front-end, integrating 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 direct 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-instructionset-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, and three serial I/O ports (SPI, UART, and I2C-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.

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. 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 52-lead MQFP and 56-lead LFCSP packages.

Applications

Intelligent Sensors (IEEE1451.2-Compatible)
Weigh Scales
Portable Instrumentation
Pressure Transducers
4–20 mA Transmitters

Features and Benefits

High-Resolution Sigma-Delta ADCs

Dual 16-Bit Independent ADCs
Programmable Gain Front End
16-Bit No Missing Codes, Primary ADC
13-Bit p-p Resolution @ 20 Hz, 20 mV Range
16-Bit p-p Resolution @ 20 Hz, 2.56 V Range

Dual 16-Bit Independent ADCs

Programmable Gain Front End

16-Bit No Missing Codes, Primary ADC

13-Bit p-p Resolution @ 20 Hz, 20 mV Range

16-Bit p-p Resolution @ 20 Hz, 2.56 V Range

Memory

8 Kbytes On-Chip Flash/EE Program Memory
640 Bytes On-Chip Flash/EE Data Memory
Flash/EE, 100 Year Retention, 100 Kcycles Endurance
256 Bytes On-Chip Data RAM

8 Kbytes On-Chip Flash/EE Program Memory

640 Bytes On-Chip Flash/EE Data Memory

Flash/EE, 100 Year Retention, 100 Kcycles Endurance

256 Bytes On-Chip Data RAM

8051-Based Core

8051-Compatible Instruction Set (12.58 MHz Max)
32 kHz External Crystal, On-Chip Programmable PLL
Three 16-Bit Timer/Counters
26 Programmable I/O Lines
11 Interrupt Sources, Two Priority Levels

8051-Compatible Instruction Set (12.58 MHz Max)

32 kHz External Crystal, On-Chip Programmable PLL

Three 16-Bit Timer/Counters

26 Programmable I/O Lines

11 Interrupt Sources, Two Priority Levels

Power

Specified for 3 V and 5 V Operation
Normal: 3 mA @ 3 V (Core CLK = 1.5 MHz)
Power-Down: 20 μA (32 kHz Crystal Running)

Specified for 3 V and 5 V Operation

Normal: 3 mA @ 3 V (Core CLK = 1.5 MHz)

Power-Down: 20 μA (32 kHz Crystal Running)

On-Chip Peripherals

On-Chip Temperature Sensor
12-Bit Voltage Output DAC
Dual Excitation Current Sources
Reference Detect Circuit
Time Interval Counter (TIC)
UART Serial I/O
I2C®-Compatible and SPI® Serial I/O
Watchdog Timer (WDT), Power Supply Monitor (PSM)

On-Chip Temperature Sensor

12-Bit Voltage Output DAC

Dual Excitation Current Sources

Reference Detect Circuit

Time Interval Counter (TIC)

UART Serial I/O

I2C®-Compatible and SPI® Serial I/O

Watchdog Timer (WDT), Power Supply Monitor (PSM)

Processors & DSP

8052 Core Products

Data Sheets

Document	note
ADuC816: MicroConverter® , Dual-Channel 16-Bit ADCs with Embedded Flash MCU Data Sheet (Rev. B)	PDF 1.01 M
ADuC816: Errata Sheet (Rev. A.0)	PDF 41 kB

Application Notes

Document	note
AN-282: Fundamentals of Sampled Data Systems	PDF 2131 kB
AN-644: Frequency Measurement Using Timer 2 on a MicroConverter ® (uC013) (Rev. 0) AN-644 Files (uC013)	PDF 62 kB
AN-645: Interfacing an HD44780 Character LCD to a MicroConverter ® (uC014) (Rev. 0) AN-645 Files (uC014)	PDF 97 kB
AN-660: XY-Matrix Keypad Interface to MicroConverter® (Rev. 0) AN-660 Accompanying Source Code	PDF 286 kB
AN-759: Expanding the Number of DAC Outputs on the ADuC8xx and ADuC702x Families (uC012) (Rev. 0) AN-759 Companion Code (zip, 3,464 bytes)	PDF 112 kB
AN-709: RTD Interfacing and Linearization Using an ADuC8xx MicroConverter&® (Rev. 0) AN-709 Accompanying Files (Tools and Source Code)	PDF 698 kB
AN-1074: Understanding the Serial Download Protocol (Formerly uC004) (Rev. 0)	PDF 245 kB
UC-018: Uses of the Time Interval Counter (Rev. prA) uC018 Files	PDF 632 kB
UC-001: MicroConverter® I2C® Compatible Interface uC001 Files	PDF 126 kB
UC-009: Addressing 16MB of External Data Memory	PDF 173 kB
UC-006: A 4-wire UART-to-PC Interface uC006 Gerber File (1) uC006 Files uC006 Gerber Files (2)	PDF 157.71 K

User Guides

Document	note
UG-041: ADuC8xx Evaluation Kit Getting Started User Guide	PDF 679 kB
ADuC816 Quick Reference Guide	PDF 342 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
ADUC816BCPZ Production	56 ld LFCSP (8x8mm, 6.1mm EP)	OTH 260	-40 to 85C	6.43	5.66	Y
ADUC816BCPZ-REEL Last Time Buy	56 ld LFCSP (8x8mm, 6.1mm EP)	REEL 0	-40 to 85C	0	0	N
ADUC816BSZ Production	52 ld MQFP (13.90mm width)	OTH 96	-40 to 85C	10.47	9.22	Y
ADUC816BSZ-REEL Production	52 ld MQFP (13.90mm width)	REEL 800	-40 to 85C	10.47	9.22	Y