ADT7316 Datasheet, PDF (1/32 Pages) Analog Devices – SPI/I2C Compatible, 10-Bit Digital Temperature Sensor and Quad Voltage Output 12/10/8-Bit DAC

PRELIMINARY TECHNICAL DATA
= SPI/I2C Compatible, 10-Bit Digital Temperature
Sensor and Quad Voltage Output 12/10/8-Bit DAC
Preliminary Technical Data
ADT7316/7317/7318
FEATURES
ADT7316 - Four 12-Bit DACs
ADT7317 - Four 10-Bit DACs
ADT7318 - Four 8-Bit DACs
Buffered Voltage Output
Guaranteed Monotonic By Design Over All Codes
10-Bit Temperature to Digital Converter
Temperature range: -40^oC to +125^oC
Temperature Sensor Accuracy of ±0.5^oC
Supply Range : + 2.7 V to + 5.5 V
DAC Output Range: 0 - 2V_REF
Power-Down Current 1µA
Internal 2.25 V_Ref Option
Double-Buffered Input Logic
Buffered / Unbuffered Reference Input Option
Power-on Reset to Zero Volts
Simultaneous Update of Outputs (LDAC Function)
On-Chip Rail-to-Rail Output Buffer Amplifier
I²C^, SPI^TM, QSPI^TM, MICROWIRE^TM and DSP-Compatible 4-
wire Serial Interface
16-Lead QSOP Package
APPLICATIONS
Portable Battery Powered Instruments
Personal Computers
Telecommunications Systems
Electronic Test Equipment
Domestic Appliances
Process Control
GENERAL DESCRIPTION
The ADT7316/7317/7318 combines a 10-Bit Tempera-
ture-to-Digital Converter and a quad 12/10/8-Bit DAC
respectively, in a 16-Lead QSOP package. This includes a
bandgap temperature sensor and a 10-bit ADC to monitor
and digitize the temperature reading to a resolution of
0.25^oC. The ADT7316/17/18 operates from a single
+2.7V to +5.5V supply. The output voltage of the DAC
ranges from 0 V to 2V_REF , with an output voltage settling
time of typ 7 msec. The ADT7316/17/18 provides two
serial interface options, a four-wire serial interface which
is compatible with SPI^TM, QSPI^TM, MICROWIRE^TM and
DSP interface standards; and a two-wire I²C interface. It
features a standby mode that is controlled via the serial
interface.
The reference for the four DACs is derived either inter-
nally or from two reference pins (one per DAC pair) .The
outputs of all DACs may be updated simultaneously using
the software LDAC function or external LDAC pin. The
ADT7316/7317/7318 incorporates a power-on-reset cir-
cuit, which ensures that the DAC output powers-up to
zero volts and it remains there until a valid write takes
place.
The ADT7316/7317/7318’s wide supply voltage range,
low supply current and SPI/I²C-compatible interface,
make it ideal for a variety of applications, including per-
sonal computers, office equipment and domestic appli-
ances.
ON- CH IP
TEMPERA TURE
SEN SOR
INTERNAL TEMPERATURE
VA LUE REGISTER
D+ 7
D- 8
ANAL OG
MU X
A -TO-D
CON VERTER
V_DD
VA LUE
R EGISTER
V_DD
SENSOR
EXTERNA L TEMPERATURE
VALUE REGISTER
ADT7316/17/18
LIMIT
COM PAR AT OR
STA TUS
REGISTER S
ADDRESS POINTER
R EGIST ER
T_HIGH LIMIT
REGIST ERS
T _LOW L IMIT
REGIST ER S
V_DD L im it
R EGIST ERS
CONTROL CONFIG . 1
REGISTER
CONTROL CONFIG. 2
REGIST ER
CONTROL CONFIG . 3
R EGISTER
DA C CONFIGURATION
R EGIST ER
L DA C CONFIGURATION
REGISTER
INTERRUPT MASK
REGISTERS
DAC A
REGISTER S
DA C B
REG ISTERS
DAC C
REGISTER S
DAC D
R EGISTER S
STR ING
DAC A
2 ^VOUT^-A
STR IN G
DA C B
1 ^VOUT^-B
ST RIN G
DA C C
16 ^VOUT^-C
STR IN G
DA C D
15 ^VOUT^-D
GAIN POWER
SELECT DOWN
LO GIC L OGIC
10 INTERRUPT
6
5
V_DD
GND
SMB us/SPI INTERFACE
4 13
12
11
CS SCL/SCL K SDA /DIN DOUT/ADD
9
LDAC
3
VREF-A B
INTERNAL TEMP
SENSOR
14
VR EF-C D
FUNCTIONAL BLOCK DIAGRAM
REV. PrN 02/02
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
I²C is a registered trademark of Philips Corporation
* Protected by U.S. Patent No. 5,969,657; other patents pending.
SPI and QSPI are trademarks of Motorola, INC.
MICROWIRE is a trademark of National Semiconductor Corporation.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
Analog Devices, Inc., 2002