ADUC834 MicroConverter®, Dual 16-Bit/24-Bit Σ-Δ ADCs with Embedded 62 kB Flash MCU

The ADuC834 is a complete smart transducer front end, integrating two high resolution - ADCs, an 8-bit MCU, and program/data Flash/EE memory on a single chip.

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 and programmable output data rates are intended for the measurement of wide dynamic range, low frequency signals, such as those in weigh scale, strain-gage, pressure transducer, or temperature measurement applications.

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 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 with 12 core clock periods per machine cycle.

62 Kbytes of nonvolatile Flash/EE program memory, 4 Kbytes of nonvolatile Flash/EE data memory, and 2304 bytes of data RAM are provided on-chip. The program memory can be configured as data memory to give up to 60 Kbytes of NV data memory in data logging applications.

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 ADuC834 is supported by a QuickStart™ development system featuring low cost software and hardware development tools.

Applications

Features and Benefits

High Resolution - ADCs

2 Independent ADCs (16-Bit and 24-Bit Resolution)
24-Bit No Missing Codes, Primary ADC
21-Bit rms (18.5-Bit p-p) Effective Resolution @ 20 Hz
Offset Drift 10 nV/C, Gain Drift 0.5 ppm/C

2 Independent ADCs (16-Bit and 24-Bit Resolution)

24-Bit No Missing Codes, Primary ADC

21-Bit rms (18.5-Bit p-p) Effective Resolution @ 20 Hz

Offset Drift 10 nV/C, Gain Drift 0.5 ppm/C

Memory

62 Kbytes On-Chip Flash/EE Program Memory
4 Kbytes On-Chip Flash/EE Data Memory
Flash/EE, 100 Year Retention, 100 Kcycles Endurance
3 Levels of Flash/EE Program Memory Security
In-Circuit Serial Download (No External Hardware)
High Speed User Download (5 Seconds)
2304 Bytes On-Chip Data RAM

62 Kbytes On-Chip Flash/EE Program Memory

4 Kbytes On-Chip Flash/EE Data Memory

Flash/EE, 100 Year Retention, 100 Kcycles Endurance

3 Levels of Flash/EE Program Memory Security

In-Circuit Serial Download (No External Hardware)

High Speed User Download (5 Seconds)

2304 Bytes On-Chip Data RAM

8051-Based Core

8051 Compatible Instruction Set
32 kHz External Crystal
On-Chip Programmable PLL (12.58 MHz Max)
3 16-Bit Timer/Counter
26 Programmable I/O Lines
11 Interrupt Sources, Two Priority Levels
Dual Data Pointer, Extended 11-Bit Stack Pointer

8051 Compatible Instruction Set

32 kHz External Crystal

On-Chip Programmable PLL (12.58 MHz Max)

3 16-Bit Timer/Counter

26 Programmable I/O Lines

11 Interrupt Sources, Two Priority Levels

Dual Data Pointer, Extended 11-Bit Stack Pointer

See data sheet for additional features

Processors & DSP

8052 Core Products

Data Sheets

Document	note
ADuC834: MicroConverter® Dual 16-/24- Bit SIgma-Delta ADCs with Embedded 62KB Flash MCU Data Sheet (Rev. B)	PDF 886.96 K
ADuC834: Silicon Errata Sheet (Rev. F)	PDF 233 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-1139: Understanding the Parallel Programming Protocol (Rev. 0)	PDF 174 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-002: Developing in C with the Keil uVision2 IDE uC002 Files	PDF 0 kB
UC-007: User Download (ULOAD) Mode uC007 Files	PDF 0 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
UC-008: Using the ADuC834 C-library	PDF 290 kB

User Guides

Document	note
UG-041: ADuC8xx Evaluation Kit Getting Started User Guide	PDF 679 kB
ADuC834 Quick Reference Guide	PDF 392 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
ADUC834BCPZ Production	56 ld LFCSP (8x8mm, 6.1mm EP)	OTH 260	-40 to 85C	14.17	12.47	Y
ADUC834BCPZ-REEL Last Time Buy	56 ld LFCSP (8x8mm, 6.1mm EP)	REEL 2500	-40 to 85C	0	12.47	Y
ADUC834BSZ Production	52 ld MQFP (13.90mm width)	OTH 96	-40 to 125C	14.17	12.47	Y