AD7143ACPZ Analog Devices Inc, AD7143ACPZ Datasheet - Page 13

• Manufacturer Part Number: AD7143ACPZ
• Description: IC, CDC, 16BIT, SMD, LFCSP-16, 7143
• Manufacturer: Analog Devices Inc

Specifications of AD7143ACPZ

• Supply Voltage Range: 2.6V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LFCSP
• No. Of Pins: 16
• Svhc: No SVHC (18-Jun-2010)
• Package / Case: LFCSP
• Base Number: 7143
• Ic Function: Programmable Controller For Capacitance Touch Sensors
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CAPACITANCE SENSOR INPUT CONFIGURATION
Each input connection from the external capacitance sensors to
the AD7143 converter can be uniquely configured by using the
registers in Table 38 and Table 39. These registers are used to
configure input pin connection setups, sensor offsets, sensor
sensitivities, and sensor limits for each stage. Each sensor can be
individually optimized. For example, a button sensor connected
to STAGE0 can have a different sensitivity and offset values
than a button with a different function that is connected to a
different stage.
CIN INPUT MULTIPLEXER SETUP
The CIN_CONNECTION_SETUP registers in Table 38 list the
available options for connecting the sensor input pin to the CDC.
CIN0
CIN1
CIN2
CIN3
CIN4
CIN5
CIN6
CIN7
CIN CONNECTION SETUP BITS
Figure 20. Input Mux Configuration Options
00
01
10
11
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CINx CONNECTED TO
NEGATIVE CDC INPUT
CINx CONNECTED TO
POSITIVE CDC INPUT
CINx CONNECTED TO
INTERNAL BIAS
CINx FLOATING
CIN SETTING
The AD7143 has an on-chip multiplexer to route the input
signals from each pin to the input of the converter. Each input
pin can be tied to either the negative or the positive input of the
CDC or can be left floating. Each input can also be internally
connected to the C
an input is not used, always connect it to C
Connecting a CINx input pin to the positive CDC input results
in a decrease in CDC output code when the corresponding
sensor is activated. Connecting a CINx input pin to the negative
CDC input results in an increase in CDC output code when the
corresponding sensor is activated.
Two bits in each sequencer stage register control the mux
setting for the input pin.
SHIELD
+
–
signal to help prevent cross coupling. If
CDC
SHIELD
.
AD7143