®
MicroConverter , Dual 16-Bit ꢀ-ꢁ
ADCs with Embedded 62 kB Flash MCU
ADuC836
FEATURES
FUNCTIONAL BLOCK DIAGRAM
High Resolution ꢀ-ꢁ ADCs
AV
DD
2 Independent ADCs (16-Bit Resolution)
16-Bit No Missing Codes, Primary ADC
16-Bit rms (16-Bit p-p) Effective Resolution @ 20 Hz
Offset Drift 10 nV/ꢂC, Gain Drift 0.5 ppm/ꢂC
Memory
62 Kbytes On-Chip Flash/EE Program Memory
4 Kbytes On-Chip Flash/EE Data Memory
Flash/EE, 100Year 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 ꢃ 16-BitTimer/Counter
AV
DD
ADuC836
IEXC1
IEXC2
CURRENT
SOURCE
AIN1
AIN2
PRIMARY
16-BITꢀ-ꢁ ADC
BUF
PGA
MUX
MUX
12-BIT
DAC
BUF
DAC
AIN3
AIN4
AIN5
AGND
DUAL
16-BIT
ꢀ-ꢁDAC
AUXILIARY
16-BITꢀ-ꢁ ADC
PWM0
PWM1
MUX
TEMP
SENSOR
DUAL
16-BIT
PWM
EXTERNAL
INTERNAL
BAND GAP
REFIN–
REFIN+
V
REF
DETECT
V
REF
8051-BASED MCU WITH ADDITIONAL
PERIPHERALS
RESET
62 KBYTES FLASH/EE PROGRAM MEMORY
4 KBYTES FLASH/EE DATA MEMORY
2304 BYTES USER RAM
DV
DD
POR
3 ꢃ 16 BIT TIMERS
BAUDRATE TIMER
POWER SUPPLY MON
WATCHDOG TIMER
DGND
PLL AND PROG
CLOCK DIV
2
4 ꢃ PARALLEL
PORTS
UART, SPI, AND I C
WAKE-UP/
RTC TIMER
OSC
SERIAL I/O
26 Programmable I/O Lines
11 Interrupt Sources, 2 Priority Levels
Dual Data Pointer, Extended 11-Bit Stack Pointer
On-Chip Peripherals
XTAL1 XTAL2
GENERAL DESCRIPTION
Internal Power on Reset Circuit
The ADuC836 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.
12-BitVoltage Output DAC
Dual 16-Bit ꢀ-ꢁ DACs/PWMs
On-ChipTemperature Sensor
Dual Excitation Current Sources
Time Interval Counter (Wake-Up/RTCTimer)
UART, SPI®, and I2C® Serial I/O
High Speed Baud Rate Generator (Including 115,200)
WatchdogTimer (WDT)
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 measure-
ment of wide dynamic range, low frequency signals, such as those
in weigh scale, strain gage, pressure transducer, or temperature
measurement applications.
Power Supply Monitor (PSM)
Power
Normal: 2.3 mA Max @ 3.6V (Core CLK = 1.57 MHz)
Power-Down: 20 ꢄA Max withWake-UpTimer Running
Specified for 3V and 5V Operation
Package andTemperature Range
52-Lead MQFP (14 mm ꢃ 14 mm), –40ꢂC to +125ꢂC
56-Lead CSP (8 mm ꢃ 8 mm), –40ꢂC to +85ꢂC
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.
APPLICATIONS
Intelligent Sensors
Weigh Scales
Portable Instrumentation, Battery-Powered Systems
4–20 mATransmitters
Data Logging
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 ADuC836 is supported by a QuickStart™
development system featuring low cost software and hardware
development tools.
Precision System Monitoring
REV. 0
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