MAX7651 Datasheet, PDF (1/36 Pages) Maxim Integrated Products – Flash Programmable 12-Bit Integrated Data-Acquisition Systems

19-2119; Rev 0; 8/01
Flash Programmable 12-Bit Integrated
Data-Acquisition Systems
General Description
The MAX7651/MAX7652 are complete 12-bit data-acqui-
sition systems featuring an algorithmic, switched-capaci-
tor, analog-to-digital converter (ADC), a pulse-
width-modulated digital-to-analog converter (DAC), three
timer/counters, and an industry-standard 8051 micro-
processor core with a variety of I/O peripherals. Power-
down capability and full functionality with supply voltages
as low as +3V make the MAX7651/MAX7652 suitable for
portable and power-sensitive applications.
The MAX7651/MAX7652 perform fully differential voltage
measurements with 12-bit resolution, programmable gain,
and separate track-and-hold for both positive and nega-
tive inputs. The converter accepts versatile input modes
consisting of four 2-channel signal pairs or eight 1-chan-
nel signals relative to a floating common.
The MAX7651/MAX7652 microprocessor systems feature
a CPU, 256 bytes of RAM, two 8kB flash memory, four
8-bit I/O ports, two UARTs, an interrupt controller, and a
watchdog timer. Only four clock cycles are required to
complete each microprocessor instruction.
The MAX7651/MAX7652 are available in 64-pin TQFP
packages.
Applications
Hand-Held Instruments
Portable Data-Acquisition Systems
Temperature Controllers
Smart Transmitters
Data Loggers
Multi-Channel Data-Acquisition with Data Formatting
Features
o 12-Bit 53ksps ADC with Fully Differential Inputs
o Dual 8-Bit PWM DAC Outputs
o Three Timers
o 4-Clock Cycle 8051-Compatible Instruction Set
with Dual Data Pointers
o Programmable Watchdog Supervisor
o Four Parallel I/O Ports
o Dual Serial I/O Ports (up to 375kb)
o +3V or +5V Single-Supply Operation
o DC to 12MHz Clock Speed
o 64-Pin TQFP Package
PART
MAX7651CCB
MAX7651ECB
MAX7652CCB
MAX7652ECB
Ordering Information
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
64 TQFP
64 TQFP
64 TQFP
64 TQFP
Pin configuration appears at end of data sheet.
Functional Diagram
MAX7651
MAX7652
FOUR
8-BIT
I/O
PORTS
256 BYTES
RAM
SFR BUS
UPPER
8k BYTE
FLASH
2000H–
3FCOH
LOWER
8k BYTE
FLASH
8051
0000H–
CPU
1FFFH
MEMORY ADDRESS
AND DATA BUSES
INTERRUPT
CONTROLLER
EXT MEM
INT0
INT1
WATCHDOG
TIMER
SERIAL
PORT 0
SERIAL
PORT 1
TIMER 0
TIMER 1
TIMER 2
PULSE-
WIDTH
MODULATOR
TXD RXD TXD RXD _{T0 T1 T2}
T2_OUT
PWMA PWMB
T2_OUT
OUTPUT OUTPUT
12-BIT
A/D
CONVERTER
AIN0
ANALOG
INPUTS
AIN7
REF+
REF-
ACOM
________________________________________________________________ Maxim Integrated Products 1
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