PRELIMINARY TECHNICAL DATA
®
aADuC842 MicroConverter , 12- Bit ADCs and DACs
with Embedded Hi-Speed 62KB FLASH MCU
Preliminary Technical Data
ADuC842
FEATU RES
F U N C T IO N AL BLO C K D IAG RAM
P IN CO M P ATABLE
Up g ra d e t o ADu C812/ ADu C832
IN CREAS ED P ERFO RM AN CE
ADuC842
12-BIT
DAC
BU F
BU F
D AC
D AC
S in g le Cycle 16MIPS 8052 co re
Hig h S p e e d 400kS PS 12-Bit ADC
IN CREAS ED M EM O RY
62Kbyte s On-Chip Fla sh/ EE Progra m Me m ory
A D C0
12-BIT
DAC
400 K SP S
12 -B IT A D C
A D C1
T/H
.
.
.
16-BIT
Σ∆ DAC
MU X
A D C5
16-BIT
Σ∆ DAC
P WM 0
PW M1
H AR DWAR E
C ALIBR A TION
A D C6
MU X
4KBytes On-Chip Flash/ EE Data Mem ory
16-BIT
PWM
A D C7
In circu it re -p ro g ra m m a b le
Fla s h / EE, 100 Yr Re t e n t io n , 100 Kcycle s En d u ra n ce
2304 Bytes On-Chip Data RAM
16-BIT
PWM
TEM P
S EN SO R
16 MIP S 8 0 51 -B AS ED MC U WITH AD D IT IONA L
PE RIP HER ALS
62 K BY TES FLA SH /EE PR OGR AM M EMO RY
S M ALLER P ACKAG E
P LL
4
KB YTES FLA SH /E E DA TA MEM OR Y
2304 BY TE S US ER R AM
Ava ila b le in 8m m x 8m m Ch ip S ca le Pa cka g e
Also available in 52 pin PQFP - pin com patable w it h
ADu C812/ ADu C831
POW ER S UP PLY M ON
WA TC H DO G TIME R
3 × 16 B IT TIM ERS
× R E AL TIM E C LOC K
1
INTE RN AL
BA N DG AP
V R EF
OSC
4 × P AR A L LE L
P ORTS
U A RT , I2C AN D SPI
S ERIA L I/O
ANALOG I/ O
VR E F
X TAL1 XT AL2
8-Ch a n n e l, 400kS PS Hig h Accu ra cy, 12-Bit ADC
On -Ch ip , 20 p p m / o C Vo lt a g e Re fe re n ce
G E NE R AL D E S C R IP T IO N
DMA Controlle r, High-Spe e d ADC-to-RAM ca pture
Tw o 12-Bit Vo lt a g e Ou t p u t DACs
Du a l Ou t p u t PWM-SD DACs
On -Ch ip Te m p e ra t u re Mo n it o r Fu n ct io n
8051 Ba s e d Co re
8051-Co m p a t ib le In s t ru ct io n S e t (16.7 MHz Ma x)
Hig h p e rfo rm a n ce S in g le Cycle Co re *
32kHz Ext Crys t a l,On -Ch ip Pro g ra m m a b le -PLL
12 In t e rru p t S o u rce s , Tw o Prio rit y Le ve ls
Du a l Da t a Po in t e rs , Extended 11-bit Stack Pointer
O n -Ch ip Pe r ip h e r a ls
The ADuC842 is a complete smart transducer front-end, inte-
grating a high-performance self calibrating multichannel ADC,
dual DAC and an optimized single cycle 16MHz 8-bit
MCU(8051 instruction set compatible) on a single chip.
The device operates from a 32 kHz crystal with an on-chip PLL
generating a high-frequency clock of 16.77MHz. This clock is,
in turn, routed through a programmable clock divider from
which the MCU core clock operating frequency is generated.
The microcontroller is an optimized 8052 core offering up to 16
MIPS peak performance. 62 Kbytes of nonvolatile Flash/EE
program memory are provided on-chip. 4 Kbytes of nonvolatile
Flash/EE data memory, 256 bytes RAM and 2 KBytes of ex-
tended RAM are also integrated on-chip.
Tim e In t e rva l Co u n t e r (TIC)
UART, I2C a n d S PI® S e ria l I/ O
Watchdog Tim er (WDT),
The ADuC842 also incorporates additional analog functionality
with two 12-bit DACs, power supply monitor, and a bandgap
reference. On-chip digital peripherals include two 16-bit Σ∆
DACs, dual output 16-bit PWM, watchdog timer, time interval
counter, three timers/counters, and three serial I/O ports (SPI,
I2C and UART).
Pow er Supply Monitor (PSM)
P o w e r
No rm a l: 6m A @ 5 V (Co re CLK = 2.098 MHz)
Pow er-Dow n: 15µA @ 3 V
De ve lo p m e n t To o ls
Lo w Co s t , co m p re h e n s ive d e ve lo p m e n t s ys t e m
in co rp o ra t in g n o n -in t ru s ive s in g le p in e m u la t io n
IDE based, assem bly and C source debug
On the ADuC812 and ADuC832 the I2C and SPI interfaces
shared some of the same pins. For backwards compatability
this is also the case for the ADuC842. However, there is also
the option to allow SPI operate separately on P3.3, P3.4 and
P3.5 while I2C uses the standard pins. The I2C interface has
also been enhanced to offer repeated start, general call and
quad addressing.
AP P LICATIO N S
Op t ica l Ne t w o rkin g - La s e r Po w e r Co n t ro l
Ba s e s t a t io n S y s t e m s
Pre cis io n In s t ru m e n t a t io n , S m a rt S e n s o rs
Tra n s ie n t Ca p t u re S ys t e m s
DAS a n d Co m m u n ica t io n s S ys t e m s
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 ADuC842 is
shown above.
M icroC onverter is
SPI is a registered trademark of Motorola Inc.
68% of insturctions completed in one or two clock cycles
a registered trademark of Analog D evices, Inc.
*
The part is specified for 3V and 5V operation with a maximum
operating frequency of 16.777MHz.
REV. PrB
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2003
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