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LDC2112 Datasheet(PDF) 11 Page - Texas Instruments

Part # LDC2112
Description  Inductive Touch Solution for Low-Power HMI Button Applications
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LDC2112 Datasheet(HTML) 11 Page - Texas Instruments

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Inductive
Sensing Core
IN0
Logic
GND
SCL
SDA
I
2C
LPWRB
IN3
COM
LDC2114
Digital
Algorithm
INTB
VDD
Resonant
Circuit
Driver
OUT0
IN1
IN2
OUT1
OUT2
OUT3
Copyright © 2016, Texas Instruments Incorporated
11
LDC2112, LDC2114
www.ti.com
SNOSD15B – DECEMBER 2016 – REVISED APRIL 2017
Product Folder Links: LDC2112 LDC2114
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
Functional Block Diagram (continued)
Figure 11. Block Diagram of LDC2114
7.3 Feature Description
7.3.1 Multi-Channel and Single-Channel Operation
The LDC2112 provides two independent sensing channels; the LDC2114 provides four independent sensing
channels. In the following sections, some parameters, such as DATAn and SENSORn_CONFIG, contain a
channel index n. In those instances, n = 0 or 1 for LDC2112, and n = 0, 1, 2, or 3 for LDC2114.
The LDC2112's two available channels are always enabled in Normal Power Mode. The LDC2112 sequentially
samples both channels at the configured scan rate. Either channel can be independently enabled in Low Power
Mode by setting the LPENn (n = 0 or 1) bit fields in Register EN (Address 0x0C).
Any of the LDC2114’s four available channels can be independently enabled by setting the ENn and LPENn (n =
0, 1, 2, or 3) bit fields in Register EN (Address 0x0C). The low-power-enable bit LPENn only takes effect if the
corresponding ENn bit is also set. If only one channel is set active, the LDC2114 periodically samples the single
active channel at the configured scan rate. When several channels are set active, the LDC2114 operates in
multi-channel mode, and it sequentially samples the active channels at the configured scan rate. Each channel of
the LDC2114 can be independently enabled in Low Power Mode and Normal Power Mode.
7.3.2 Button Output Interfaces
Button events may be reported by using two methods. The first method is to monitor the OUTn pins (n = 0, 1, 2,
or 3), which are push-pull outputs and can be used as interrupts to a micro-controller. The polarities of these pins
are programmable through Register OPOL_DPOL (Address 0x1C). Any button press or error condition is also
reported by the push-pull interrupt pin, INTB. Its polarity is configurable through Register INTPOL (Address
0x11). Any assertion of INTB is cleared upon reading Register STATUS (Address 0x00). Each push-pull output
must be assigned to a dedicated general-purpose input pin on the micro-controller to avoid potential current
fights.
The second method is by use of the LDC2112/LDC2114’s I2C interface. The Register OUT (Address 0x01)
contains the fields OUT0, OUT1, OUT2, and OUT3, which indicate when a button press has been detected. For
more advanced button press measurements, the output DATAn registers (n = 0, 1, 2, or 3, Addresses 0x02
through 0x09), which are 12-bit two’s complements, can be retrieved for all active buttons, and processed on a
micro-controller. A valid button push is represented by a positive value. The polarity is configurable in Register
OPOL_DPOL (Address 0x1C). The DATAn values can be used to implement multi-level buttons, where the data
value is correlated to the amount of force applied to the button.


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