AMC7832 Datasheet, PDF (4/70 Pages) Texas Instruments – AMC7832 12-Bit Analog Monitor and Control Solution with Multi-Channel ADC, Bipolar DACs, Temperature Sensor and GPIO Ports

AMC7832
SLAS836 – MARCH 2014
www.ti.com
Terminal Functions
TERMINAL
NUMBER
NAME
DESCRIPTION
1
DGND
Digital ground. Ground reference point for all digital circuitry on the device. Ideally, AGND and DGND should be at the
same potential (GND) and must not differ by more than ±0.3-V.
2
DV_DD
Digital supply voltage. (+4.5-V to +5.5-V). Must be the same value as AV_DD.
3
IOV_DD
IO supply voltage. (+1.8-V to +5.5-V). Sets the IO operating voltage and threshold levels. Must not exceed DV_DD.
4
RESET
Reset input, active low. Logic low on this terminal causes the device to perform a hardware reset.
5
SDO
Serial interface data output. The SDO terminal is in high impedance when CS is high. Data is clocked out of the input
shift register on each falling edge of SCLK.
6
SDI
Serial interface data input. Data is clocked into the input shift register on each rising edge of SCLK.
7
SCLK
Serial interface clock.
8
CS
Active low serial data enable. This input is the frame synchronization signal for the serial data. When this signal goes
low, it enables the input shift register.
General purpose digital I/O 0 (default). This terminal is a bidirectional open-drain, digital input/output with internal 48-
9
GPIO0/ALARMIN kΩ pull-up resistor to IOV_DD. Alternatively the terminal can be set to operate as ALARMIN, an alarm control signal,
digital input, active low.
General purpose digital I/O 1 (default). This terminal is a bidirectional open-drain, digital input/output with internal 48-
10
GPIO1/ ALARMOUT kΩ pull-up resistor to IOV_DD. Alternatively the terminal can be set to operate as ALARMOUT, a global alarm. Open
drain output. This terminal goes low (active) when an alarm event is detected.
General purpose digital I/O 2 (default). This terminal is a bidirectional open-drain, digital input/output with internal 48-
11
GPIO2/ADCTRIG kΩ pull-up resistor to IOV_DD. Alternatively the terminal can be set to operate as ADCTRIG, an external conversion
trigger, active low. The falling edge starts the sampling and conversion of the ADC.
General purpose digital I/O 3 (default). This terminal is a bidirectional open-drain, digital input/output with internal 48-
12
GPIO3/DAV
kΩ pull-up resistor to IOV_DD. Alternatively the terminal can be set to operate as DAV, Data available indicator, active
low output. In direct mode, the DAV terminal goes low (active) when the conversion ends. In auto mode, a 1µs pulse
(active low) appears on this terminal when a conversion cycle finishes. DAV stays high when deactivated.
13
GPIO-4
14
GPIO-5
General purpose digital I/O. This terminal is a bidirectional open-drain, digital input/output with internal 48-kΩ pull-up
15
GPIO-6
resistor to IOV_DD.
16
GPIO-7
17
AV_EE
Lowest potential in the system. Typically tied to -12-V but if all DACs are set in a positive output range it should be
connected to AGND.
18,19, 22, 24
DAC_A11,
DAC_A10,
DAC_A9,
DAC_A8
DAC group A. These channels share the same range and clamp voltage.
20
AVSS_A
Negative analog supply for DAC group A. Sets the power-on-reset and clamp voltage values. Typically tied to AVEE
when the DAC range for group A is set to -10 to 0-V or AGND for the positive output ranges.
21
VRANGE_A
This terminal determines the DAC range for DAC group A. If tied to AGND the DAC range is 0 to +5-V or 0 to+10-V.
Otherwise if tied to +2.5-V (can be tied to REF_OUT terminals) the DAC range is -10 to 0-V.
23
AGND1
Analog ground. Ground reference point for all analog circuitry on the device, AGND. Connect AGND1, AGND2 and
AGND3 to the same potential, AGND.
25
AV_{CC_AB}
Positive analog power for DAC groups A and B. Must be tied to AV_{CC_CD}.
26
VRANGE_B
This terminal determines the DAC range for DAC group B. If tied to AGND the DAC range is 0 to +5-V or 0 to +10-V.
Otherwise if tied to +2.5-V (can be tied to REF_OUT terminals) the DAC range is -10 to 0-V.
27, 29
DAC_B7,
DAC_B6
DAC group B. These channels share the same range and clamp voltage.
28
AVSS_B
Negative analog supply for DAC group B. Sets the power-on-reset and clamp voltage values. Typically tied to AVEE
when the DAC range for group B is set to -10 to 0-V or AGND for the positive output ranges.
30
REF_OUT1
Reference output 1. Can be used to drive the VRANGE inputs.
31
AV_DD1
Analog supply voltage. (+4.5-V to +5.5-V)
32
REF_CMP
Internal reference compensation capacitor connection (connect 4.7-μF capacitor between this terminal and AGND2).
33
AGND2
Analog ground. Ground reference point for all analog circuitry on the device, AGND. Connect AGND1, AGND2 and
AGND3 to the same potential, AGND.
34
35-38
AV_DD2
ADC_11,
ADC_10,
ADC_9,
ADC_8
Analog supply voltage. (+4.5-V to +5.5-V)
Bipolar analog inputs. Typically used to monitor the DAC_A8 to DAC_A11 outputs. The input range of these channels
is -12.5-V to +12.5-V.
39-40
ADC_7,
ADC_6
Bipolar analog inputs. Typically used to monitor the DAC_B6 to DAC_B7 outputs. The input range of these channels
is -12.5-V to +12.5-V.
4
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