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PDF ( 数据手册 , 数据表 ) LC717A00AR

零件编号 LC717A00AR
描述 Capacitance-Digital-Converter LSI
制造商 ON Semiconductor
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LC717A00AR 数据手册, 描述, 功能
Ordering number : ENA2048B
LC717A00AR
CMOS LSI
Capacitance-Digital-Converter LSI
for Electrostatic Capacitive Touch
Sensors
http://onsemi.com
Overview
The LC717A00AR is a high-performance, low-cost capacitance-digital-converter LSI for electrostatic capacitive
touch sensor, especially focused on usability. It has 8 channels capacitance-sensor input. The built-in logic circuit can
detect the state (ON/OFF) of each input and output the result. This makes it ideal for various switch applications.
The calibration function is automatically performed by the built-in logic circuit during power activation or whenever
there are environmental changes. In addition, since initial settings of parameters, such as gain, are configured,
LC717A00AR can operate as stand-alone when the recommended switch pattern is applied.
Also, since LC717A00AR has a serial interface compatible with I2C and SPI bus, parameters can be adjusted using
external devices whenever necessary. Moreover, outputs of the 8-input capacitance data can be detected and measured
as 8-bit data.
Features
Detection system: Differential capacitance detection (Mutual capacitance type)
Input capacitance resolution: Can detect capacitance changes in the femto Farad order
Measurement interval (8 differential inputs): 18ms (Typ) (at initial configuration),
3ms (Typ) (at minimum interval configuration)
External components for measurement: Not required
Current consumption: 320μA (Typ) (VDD = 2.8V), 740μA (Typ) (VDD = 5.5V)
Supply voltage: 2.6V to 5.5V
Detection operations: Switch
Packages: VCT28
Interface: I2C * compatible bus or SPI selectable.
* I2C Bus is a trademark of Philips Corporation.
Semiconductor Components Industries, LLC, 2013
August, 2013
Ver1.0.1
D1912HKPC 20121130-S00003/71112HK 20120628-S00001/62012HKPC No.A2048-1/11







LC717A00AR pdf, 数据表
Block Diagram
LC717A00AR
Cref
Cin0
Cin1
Cin2
Cin3
Cin4
Cin5
Cin6
Cin7
nCS
SCL/SCK
SDA/SI
SA/SO
MUX
1st
AMP
I2C/SPI
2nd
AMP
A/D
CONVERTER
CONTROL
LOGIC
POR
OSCILLATOR
Pout0
Pout1
Pout2
Pout3
Pout4
Pout5
Pout6
Pout7
Cdrv
ERROR
INTOUT
nRST
GAIN
VDD
VSS
LC717A00AR is capacitance-digital-converter LSI capable of detecting changes in capacitance in the femto Farad order.
It consists of an oscillation circuit that generates the system clock, a power-on reset circuit that resets the system when
the power is turned on, a multiplexer that selects the input channels, a two-stage amplifier that detects the changes in the
capacitance and outputs analog-amplitude values, a A/D converter that converts the analog-amplitude values into digital
data, and a control logic that controls the entire chip. Also, it has an I2C compatible bus or SPI that enables serial
communication with external devices as necessary.
No.A2048-8/11














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