TS2043

UNISONIC TECHNOLOGIES CO., LTD TS2043 Preliminary CMOS IC TOUCH PANEL CONTROLLER DESCRIPTION The UTC TS2043 is a highly integrated 12-bit SAR analog-to-digital (A/D) converter designed for touch panel controllers. It features serial interface and low on-resistance drivers for 4-wire resistive touch panels. The UTC TS2043 contains all the analog and digital circuitry needed to complete a pen request. The UTC TS2043 features a low-power dissipation consumes only 800uW under a 125KHz sample rate and in a 2.7V supply condition, it consumes only 2.7uW at shutdown mode. The supply voltage is from 2.7V to 5.5V under normal operation. The UTC TS2043 can be used in applications such as touch panels, personal digital Assistants (PDAs), smart phones, point-to-sales terminals, high speed data acquisition, portable instruments, and low power instruments. FEATURES * Power Supply Voltage: 2.7V ~ 5.5V * Serial Interface * 4-Wire Touch Panel Interface * Embedded Touch Panel Drivers * 12-Bit AD Converter * Programmable 8 or 12 Bit Resolution * Conversion Rate: 125 KHz * 2 Auxiliary Analog Inputs * Full Power Down Control ORDERING INFORMATION Halogen Free TS2043G-R16-R Package SSOP-16 Packing Tape Reel www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd 1 of 8 QW-R502-404.a TS2043 PIN CONFIGURATION Preliminary CMOS IC PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME VDD X+ Y+ XYGND IN3 IN4 VREF VDD /PENIRQ DOUT BUSY DIN /CS DCLK DESCRIPTION Power Supply, 2.7V ~ 5.5V X+ Input; ADC Input Channel 1. Y+ Input; ADC Input Channel 2. X- Input. Y- Input. Ground. Auxiliary Input 1; ADC Input Channel 3. Auxiliary Input 2; ADC Input Channel 4. Reference Voltage Input. Power Supply, 2.7V ~ 5.5V Pen Interrupt. Requires 10KΩ ~ 100KΩ external pull-up resistor. Serial Data Output. This output pin is high impedance when /CS is high. Busy Output. This output pin is high impedance when /CS is high. Serial Data Input. Chip Select Input. This input is active low. External Clock Input. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 8 QW-R502-404.a TS2043 BLOCK DIAGRAM /PENIRQ 11 VDD 1/10 Preliminary CMOS IC DCLK 16 /CS 15 DIN 14 BUSY 13 DOUT 12 Digital Control Logic X+ 2 Y+ XY- 3 4 5 4-Channel MUX SAR DAC (Cap Array) COMP GND IN3 IN4 VREF 6 7 8 9 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 8 QW-R502-404.a TS2043 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS VDD to GND -0.3 ~ +6 Analog Input to GND -0.3 ~ VDD +0.3 Digital Input to GND -0.3 ~ VDD +0.3 Junction Temperature TJ +150 -40 ~ +85 Operating Temperature Range TOPR Storage Temperature Range TSTG -60 ~ +150 Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. UNIT V V V °C °C °C ELECTRICAL CHARACTERISTICS (TA=-40°C to 85°C, VDD=+2.7V, VREF=+2.7V, fsample=125KHz, fCLK=24*fSAMPLE, 12-bit mode, Digital inputs=GND or VDD. Typical values are at TA=+25°C, unless otherwise specified.) PARAMETER Power Supply Requirements Power Supply Nominal Supply Current SYMBOL VDD IDD TEST CONDITIONS Specified Performance Operating Range Shut Down Mode (DCLK=DIN=VDD) 800 Power Dissipation System Performance Resolution Integral nonlinear Differential nonlinear Gain Error Offset Error Digital Input/Output Logic Family /PEN Request (/PENIRQ) Analog Input Input Span Input Range Capacitance Reference Input Range Input Current X / Y Switches X+, Y+ X-, YPD Shut Down Mode (VDD=2.7V) 12 +/-2 +/-1 +/-4 +/-6 VDD*0.8 CMOS 100KΩ Pull-Up 0 -0.2 25 VREF IREF 1 Specified Performance Switch On-Resistance Switch On-Resistance 15 5 5 VDD VDD*0.7 -0.3 0.65 VREF VDD+0.2 0.4 VDD+0.3 0.8 2.7 MIN 2.7 2.7 300 1 TYP MAX 3.6 5.5 UNIT V V μA μA μW μW Bit LSB LSB LSB LSB V V V V V V V pF V μA Ω Ω INL DNL VOH VOL VIH VIL VOL UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 8 QW-R502-404.a TS2043 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT 1 TOUCH PANEL 2 3 4 5 6 7 8 VDD X+ Y+ XYGND IN3 IN4 DCLK /CS DIN BUSY DOUT /PENIRQ VDD VREF 16 15 14 13 12 11 10 9 0.1uF 0.1uF 10uF Clock Chip Select Data In Busy Status Data Out Pen Interrupt 2.7V TS2043 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 8 QW-R502-404.a TS2043 APPLICATION INFORMATION Preliminary CMOS IC OVERVIEW The UTC TS2043 is a 12-bit switched-capacitor Analog-to-Digital (A/D) converter and incorporates four channel inputs, a serial interface, and low on-resistance switches for touch panel.. It supplies from a single supply varying from +2.7V to +5.5V. It requires an external reference, which is directly limiting the input range of the converter. The four-channel multiplexer contained in the circuit decides the input to this converter (See Figure 1). In addition, an external clock is also required. OPERATION OF 24-CLOCKS The UTC TS2043 communicates with microprocessors or digital signal processors through a synchronous serial interface. For a total 24 clock cycles on the DCLK input, three serial communications are needed to complete one conversion. (See Figure 2) /CS DCLK 1 8 1 1 Acquire ON X/Y SWITGH Conversion DIN Tri-State Start A2 A1 A0 Mode1 Mode0 PD1PD0 BUSY Tri-State DOUT Tri-State 11 0 Tri-State (MSB) (LSB) Figure 2. Serial Interface of TS2043 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 8 QW-R502-404.a TS2043 Preliminary CMOS IC APPLICATION INFORMATION(Cont.) Serial Interface Once a falling signal applies on /CS pin (active in low), the operation is initiated. After /CS falls, the UTC TS2043 begins to look for a start bit on the DIN input. At the end of the operation the /CS pin should be pulled high, which minimizes supply current if DCLK is left running. Control Byte The first eight clock cycles provides the control byte on DIN pin. (See Table I and Table II for more information). The control byte represents the start operation, addressing, resolution, and power down information. Table I. Control Bits in the Control Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Start A2 A1 A0 Mode1 Mode0 PD1 PD0 Table II. Description of the Control Bits BIT NAME DESCRIPTION 7 Start Start Bit. 6,5,4 A2,A1,A0 Input Channel Select Bits. Mode1 12-Bit / 8-Bit Conversion 3,2 Mode0 Configuration Bit. 1,0 PD1,PD0 Power Down Control Bits Start Bit – Initiate Start The control byte starts with the first high bit on DIN. The first bit must always be logic high (1) to initiate the start of the conversion. The UTC TS2043 will not start until the start bit is detected. Addressing Bits – Input Channel Selection The next three bits on control byte are addressing bits (A2, A1, A0), which select the active input channel of the input multiplexer, and touch panel drivers. (See Table III for more information). Table III. Input Channel Configuration Input X Switch Y Switch Reference A2 A1 Channel 0 0 X+ OFF ON VREF 1 0 Y+ ON OFF VREF 0 1 IN3 OFF OFF VREF 1 1 IN4 OFF OFF VREF Mode Bits – Conversion Resolution Configuration The Mode bits (Mode1, Mode0) set the resolution of this device. With the Mode1 bit LOW (0), the following conversion will have 12 bits of resolution. With the Mode1 bit HIGH (1) the following conversion will have 8 bits of resolution. (See Table IV for more information.) Table IV. Resolution Configuration Mode1 Mode0 DESCRIPTION 0 1 12bits Resolution 0 0 12bits Resolution 1 1 8bits Resolution 1 0 8bits Resolution PD0 and PD1 Bits - Power Down Control The last two bits are PD1 and PD0 bits, which control the power down mode of the UTC TS2043. Through applying a same logic high(1) this device enters a power-up mode, while enters a power-down mode by a same logic low (0) on PD1 and PD0 bits.(See Table V for more information). Table V. Power-Down Selection PD1 PD0 PENIRQ DESCRIPTION 0 0 Enable Power-Down between conversions. Y- switch is on. 0 1 Disable Power-Down between conversions. Y- switch is off. /PENIRQ is disabled 1 0 Disable No used. 1 1 Disable No Power-Down between conversions. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 8 QW-R502-404.a TS2043 Preliminary CMOS IC APPLICATION INFORMATION(Cont.) OPERATION OF 16-CLOCKS The typical operation of the UTC TS2043 is 24-clocks (three control bytes) per conversion. However the control bits for the next conversion can be overlapped with current conversion for a faster conversion. Figure 3 shows the timing of 16-Clocks per conversion. /CS DCLK 1 8 1 1 8 1 X/Y SWITGH ON ON DIN BUSY DOUT 11 0 11 10 9 (MSB) (LSB) (MSB) Figure 3. Timing of 16-clocks per Conversion ANALOG INPUT There are four channel inputs in the UTC TS2043. X+ and Y+ inputs are for touch panel measurement, 2 auxiliary inputs are IN3 and IN4. The input to the A/D converter is selected via the four-channel multiplexer. (see Block Diagram) Input Channel The input channel configuration of the UTC TS2043 is shown in Table V. The control bits are set via the DIN pin. (see Control byte section). The selected channel is for A/D converter input. Please refer to Figure 5 for detailed input channel multiplexer. For measuring X+ and Y+, Y switches and X switches are turned on respectively. Reference Input An external reference voltage source is needed for the UTC TS2043. The reference input sets the Analog-to-Digital converter (ADC) input range. If the reference input is from the power supply directly, to avoid noise from power supply, special care must be taken into consideration. UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 8 QW-R502-404.a