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| 型號(hào)： | AD7709 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port |
| 中文描述： | 16位Σ-Δ型ADC電流源，可切換的基準(zhǔn)輸入和I / O端口 |
| 文件頁(yè)數(shù)： | 17/17頁(yè) |
| 文件大小： | 248K |
| 代理商： | AD7709 |
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AD7709
–17–
REV. PrA J anuary 2001
PRELIMINARY TECHNICAL DATA
C ONF IGUR ING T H E A D 7709
On the AD7709 there are only four user accessable registers and these are configured via the serial interface. Communica-
tion with any of these registers is initiated by firstly writing to the Communications Register. T he AD7709 starts convert-
ing after a power up without the requiring any register to be written to. T he defaults conditions are used and the AD7709
operates at a 20Hz update rate offering 50 and 60Hz rejection.
Figure 5 outlines a flow diagram of the sequence used to configure the registers on the AD7709 following a power-up.
T he flowchart shows two methods of determining when its valid to read the data register. T he first method is hardware
polling of the RDY pin and the second method involves software interrogation of bits in the status and mode registers. T he
flowchart details all the necessary programming steps required to initialize the ADC and read data from the selected ADC chan-
nel following a power-on or reset.T he steps can be broken down as follows:
1. Configure and initialize the microcontroller or microprocessor serial port.
2. Initialize the AD7709 by configuring the following registers:
a)FILT ER registers which determines the update rate. T he AD7709 must be put into standby mode before writing to the
filter register.
b) CONFIGURAT ION register to select the input channel to be converted, its input range and reference. T his register is
also used to configure the internal current sources, power switches and I/O port.
Both of these operations consist of a write to the communications register to specify the next operation as a write to a specified
register. Data is then written to this register. When each sequence is complete the ADC defaults to waiting for another write to
the communications register to specify the next operation.
3) When configuration is complete the user needs to determine when its valid to read the data from the data register. T his
is accomplished by either polling the RDY pin (hardware polling) or by interrogating the bits in the ST AT US register
(software polling). Both are shown in the following flowchart.
HARDWARE
POLLING
SOFTWARE
POLLING
POWER-ON/RESET FOR AD7709
CONFIGURE & INITIALIZE
m
C/
m
P SERIAL PORT
WRITE TO COMMUNICATIONS REGISTER SELECTING
NEXT OPERATION TO BE A WRITE TO
THE FILTER REGISTER (WRITE 22HEX TO COMMS REG)
WRITE TO FILTER REGISTER TO CONFIGURE
THE REQUIRED UPDATE RATE.
WRITE TO COMMUNICATIONS REGISTER SETTING UP
NEXT OPERATION TO BE A WRITE TO THE
CONFIGURATION REGISTER (WRITE 01Hex TO COMMS REG)
START
WRITE TO CONFIGURATION REGISTER TO SELECT INPUT
CHANNEL, INPUT RANGE AND REFERENCE. CURRENT
SOURCES AND I/O PORT CAN ALSO BE CONFIGURED
WRITE TO COMMUNICATIONS REGISTER SETTING UP NEXT
OPERATION TO BE A READ FROM THE STATUS REGISTER
WRITE 40HEX TO COMMS REGISTER
READ STATUS REGISTER
NO
YES
RDY=1
WRITE TO COMMUNICATIONS REGISTER SETTING UP
NEXT OPERATION TO BE A READ OF THE DATA
REGISTER. WRITE 43HEX TO COMMS REGISTER
SOFTWARE POLLING
POLL
RDY
PIN
NO
RDY
LOW
WRITE TO COMMUNICATIONS REGISTER SETTING UP
NEXT OPERATION TO BE A READ OF THE
DATA REGISTER (WRITE 43HEX TO COMMS REGISTER)
READ16-BIT DATA RESULT
YES
ANOTHER
READ
NO
CHANNEL
CHANGE
NO
YES
END
HARDWARE POLLING
READ DATA FROM OUTPUT REGISTER
READ16-BIT DATA RESULT
YES
ANOTHER
READ
NO
CHANNEL
CHANGE
NO
YES
END
Figure 5. Flowchart or Configuring and reading rom AD7709
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