AMC1210_14 Datasheet, PDF (12/54 Pages) Texas Instruments – Quad Digital Filter for 2nd-Order Delta-Sigma Modulator

AMC1210
SBAS372D – APRIL 2006 – REVISED MAY 2009.............................................................................................................................................................. www.ti.com
THEORY OF OPERATION
Overview
The AMC1210 is a flexible digital filter device specifically designed for motor control applications. It incorporates
four independent digital filters into a digital processing block, allowing communication via SPI bus or 8-bit,
multiplexed parallel I/O. Each datastream input can be clocked in using an external clock or a clock provided by
a delta-sigma modulator. A time measurement unit allows software monitoring of the sample speed and data
acquisition, and a comprehensive control and interrupt unit allows real-time monitoring of the AMC1210 status. A
digital comparator unit is provided to alert programmable peak conditions on the different datastreams. When
used in current measurement applications, the digital comparator unit can alert a system to over- or
under-current situations.
Interface Module
The AMC1210 can communicate with digital signal processors (DSPs) or microcontrollers (µCs) in four different
interface modes: one serial mode and three 8-bit, multiplexed parallel modes. The serial mode is a standard SPI
mode, normally with a 24-bit transfer. The multiplexed parallel modes are designed to work together with a wide
range of controllers. Mode pins M0 and M1 determine the mode selection. Table 2 shows the digital interface
configuration.
Table 2. Digital Interface Configuration
INTERFACE MODES
SPI
Parallel Mode 1
Parallel Mode 2
Parallel Mode 3
PIN M1
0
0
1
1
PIN M0
0
1
0
1
The digital interface pins perform different functions depending on the interface mode. Table 3 shows the pin
operations in different modes.
Table 3. Pin Functions in Different Communication Modes
PIN
SPI MODE
PARALLEL MODE 1
PARALLEL MODE 2
PARALLEL MODE 3
M1
0
0
1
1
M0
0
1
0
1
ALE
–
Address/Data Select
Address Latch Enable
Address Valid
CS
Frame sync
Chip Select
Chip Select
Chip Select
RD
SPI Data In
Read
Read
Strobe
WR
SPI Clock
Write
Write
Read/Write
AD0
SPI Data Out
Databus 0 (LSB)
Databus 0 (LSB)
Databus 0 (LSB)
AD1
–
Databus 1
Databus 1
Databus 1
AD2
–
Databus 2
Databus 2
Databus 2
AD3
–
Databus 3
Databus 3
Databus 3
AD4
–
Databus 4
Databus 4
Databus 4
AD5
–
Databus 5
Databus 5
Databus 5
AD6
–
Databus 6
Databus 6
Databus 6
AD7
–
Databus 7 (MSB)
Databus 7 (MSB)
Databus 7 (MSB)
12
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