HE80000 SERIES HFT012 Introduction HFT012 integrates 12-bit

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HE80000 SERIES HFT012 Introduction HFT012 integrates 12-bit

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HFT012
HE80000 SERIES
HFT012 Introduction
HFT012 integrates 12-bit type Analog-to-Digital converter, synchronous serial interface on-resistance switches chip. driver automatically configured position, X-plate resistance touch pressure measurements 4-wire resistive type touch screen. With built-in drivers power design techniques chip suitable battery-operated system other portable equipment application. HFT012 available 16-lead SSOP package guaranteed over degree temperature range.
HFT012 Features
Wide Supply Range: 2.7V 5.5V 4-Wire Touch Screen Interface 125Khz Sampling Rate 8/12Bit Resolution Selection Serial Input Control Serial Data Output Single Ended/Differential Reference Auxiliary Input Fully Power Down Control Position Measurement X-Plate Sheet Resistance Measurement Touch Pressure Measurement
Applications
HFT012 used Personal Data AssistantsPagersPortable InstrumentsTouch Screen Monitor Point-of-Sales Terminals.
2002
PreliminaryV1.1E
HFT012
HE80000 SERIES
Description
View SSOP
XYGnd
Dclk Busy Dout Penirql Vref
Description name Plate Drive Plate Drive Plate Drive Plate Drive Auxiliary Input plate sheet resistance measurement (requires ohms pull resistor externally) VREF Voltage Reference Input: PENIRQL Interrupt (requires 10k~100k ohms pull resistor externally DOUT Serial Data output. High impedance when CSL='1'. BUSY Busy Output. High impedance when CSL='1'. Serial Data Input Chip Select Input. Active Low. DCLK Serial Interface Clock Input Power Supply: 2.4V 5.5V
2002
PreliminaryV1.1E
HFT012
HE80000 SERIES
Block Diagram
PENIRQL
12-Bit
Serial Interface Control
DCLK DOUT BUSY
Multiplexer
Multiplexer
X+,X-,Y+,Y-
VREF
Control Setting
DESCRIPTION: CONTROL BYTE DESCRIPTION: HFT012 provides serial interface communicate with external DSP. measurement modes, resolution power down selection configured through serial receiving control from external processor. Receiving effective control activates conversion.
NAME DESCRIPTION Start bit. Control starts with first high DIN. control byte start every cycles 12-bit conversion mode cycles 8-bit conversion mode. Measurement mode selections: [1:1:1]: Reserved [1:1:0]: Plate Resistance [1:0:1]: Position [1:0:0]: Touch Pressure [0:1:1]: Touch Pressure [0:1:0]: Input [0:0:1]: Position [0:0:0]: Reserved [1]: Select 8-bit conversion mode [0]: Select 12-bit conversion mode [1]: Select single ended reference [0]: Select differential reference [1:1]: power down between conversions [1:0]: Reserved [0:1]: Power down between conversions. PENIRQ Disable when power down. [0:0]: Power down between conversions. PENIRQ enable when power down.
A2:A1:A0
8/12 PD1:PD0
2002
PreliminaryV1.1E
HFT012
HE80000 SERIES
REFERENCE INPUT SELECTIONS: reference input converter configured single ended differential input BIT[2] control bit. setup diagram shown follow:
VREF
REFP
REFP
INXREFN
INREFN
Single-Ended Reference
Differential Reference
single ended reference, VREF range VDD. There critical issue regarding single ended reference when making measurement where drivers (for example position, x-plate resistance touch pressure measurements). Since plate resistance plate fairly (~500ohms), turn resistance "SWp" "SWn" will make small difference. measurement result will possible achieve zero scale full scale. issue remedied using differential reference mode. (REFP, REFN) connected directly (VX+, VX-) when differential mode. This enables full-scale reference automatically tracking input scale. INTERRUPT: PENIRQL implemented detect touch. connecting 10k~100k ohms pulled resistor VDD, (PD1:PD0)=(0:0) mode, PENIRQL will pulled state when "touch" activated. This signal used trigger external processor start measurement. MEASUREMENT MODES: input configuration drivers listed follow:
A2:A1:A0 1:1:1 1:1:0 1:0:1 1:0:0 0:1:1 0:1:0 0:0:1 0:0:0 NAME Reserved Plate Resistance Position Touch Pressure Touch Pressure Position Reserved input Driver Drivers REFP
(Single Ended)
REFN
(Single Ended)
(VREF) (VREF) (VREF) VREF (VREF)
(GND) (GND) (GND) (GND)
2002
PreliminaryV1.1E
HFT012
HE80000 SERIES
DC/AC Characteristics
PARAMETER ISTBY SAMPLING SPEED FULL SCALE INPUT SPAN REFERENCE INPUT RESOLUTION MISSING CODES X+/Y+ RSISTANCE X-/Y- RESISTANCE PENIRQL TEMPERATURE CONDITIONS HFT012 VREF UNITS Volts Volts Volts Bits Bits OHMS OHMS Volts Volts Volts Degree
Timing Diagram
Idle DCLK BUSY DOUT S.O.C Sample Single Ended Differential mode 8/12 8/12 Serial Enable Acquire 1'st Conversion 2'nd Conversion
don't care Internal Signal
16-Clocks Conversion
2002
PreliminaryV1.1E

HE80000 SERIES HFT012 Introduction HFT012 integrates 12-bit

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