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MP3275 Datasheet PDF : 16 Pages
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MP3275
PRODUCT INFORMATION
Basic Description
The MP3275 is a fault protected data acquisition subsystem
available in monolithic form. This product contains all of the cir-
cuitry necessary to acquire 16 channels of quasi differential or
single-ended analog signals at 10 V input range and 15kHz
bandwidth. Connections to power, the analog input signals and
the digital system are all that is required. The MP3275’s input
circuitry is protected against active input signals present with the
MP3275 power off. This is also the case for any channel exceed-
TIMING
Control and Timing Considerations
The MP3275 can be operated in the stand-alone mode, with
one line for control and everything else hard-wired; or under mi-
croprocessor control, where changes can be made dynamically.
ing the MP3275 analog input dynamic range without interfering
with the channel being digitized. The channel address and
channel conversion can be managed in two ways: random
channel conversion or same channel conversion. Circuitry on
the chip adds a MUX/instrumentation amp settling delay of 10µs
max, when a new channel is selected (ADEN = 1). Conversion
start is initiated without delay for the single-channel case (ADEN
= 0). Data is available in serial format.
There are 4 control lines: ADEN, WR, CS and RD with their
functions described in Table 1.
CS WR RD ADEN Data STL STS
ADC Channel Select and Start Convert (See Figure 1. and Table 2.)
Comments
1
X
X
X
––
0
0 No operation
0
↓
1
0
Hi-Z
0
0 No operation if ADEN = 0
0
↓
1
1
Hi-Z
↑
0 Input MUX channel selected, STL set on WR falling edge
0
0
1
X
Hi-Z
1
0 MUX select disabled
0
↑
1
X
Hi-Z
0
↑ Start convert on WR rising edge
0
1
1
X
Hi-Z
↓
↑ Start convert on STL falling edge
0
1
1
X
Hi-Z
0
↓ STS goes low at end of conversion
Read ADC Data (See Figure 2. and Table 3.)
0
1
↓
X
––
0
0
X
0
X
ADC
0
0
X
↑
X
Hi-Z
0
0
1
X
X
Hi-Z
0
0
X
0
X Last ADC 1
0
0
0
Hi-Z
0
0
0
X
ADC
0
0 SDO enabled
0 Data from previous conversion on SDO
0 SDO disabled
1 SDO/RD disabled while STS high
0 Data from last conversion on SDO
↑ STL, MUX select disabled with ADEN = 0,
SDO disabled on STS rising edge
↓ New data appears on SDO on falling edge of STS
Note 1: If RD = 1, SDO remain high impedance. It is recommended that RD will not change during a conversion in
order to reduce noise. It is further recommended that RD = 1 during conversion to reject any noise present on the
SDO.
Table 1. Logic Truth Table
Rev. 4.00
6
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