PDF AKD4185 Data sheet ( Hoja de datos )

Número de pieza	AKD4185
Descripción	Low Power Touch Screen Controller
Fabricantes	AKM
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No Preview Available ! [AK4185] AK4185 Low Power Touch Screen Controller with SPI™ Interface GENERAL DESCRIPTION The AK4185 is a 4-wire/ 5-wire resistive touch screen controller that incorporates 12bit SAR A/D converter. The AK4185 operates down to 1.6V supply voltage in order to connect a low voltage microprocessor. The AK4185 has both an automatic continuous measurement and a measurement data calculation function. The functions that normally require external processing, such as calculating the average screen input value, are processed by the AK4185. In addition, a new sequential mode achieves short coordinate measurement time while greatly reducing the microprocessor overhead. The AK4185 can detect the pressed screen location by performing two A/D conversions and it can also measure touch pressure. The AK4185 is the best fit for cellular phone, DSC, DVC, smart phone, or other portable devices. FEATURES 4-wire or 5-wire Touch Screen Interface SPITM Serial Interface 12bit SAR A/D Converter with S/H circuit Sampling Rate: 300Ksps Pen Pressure Measurement (4-wire) Continuous Read Function (External Clock Mode) Integrated Internal Osc (Sequence Mode) Integrated Median Averaging Filter Low Voltage Operation: VDD = 1.6V ~ 3.6V PENIRQN Buffer Output Low Power Consumption: 240μA at 1.8V Auto Power Down Package: 12pin CSP (1.96mm x 1.46mm, pitch 0.5mm) Software Compatible with AK4182A VDD XP/BR YP/TR XN/TL YN/BL IN/ WIPER MS0954-E-05 4/5wire Touch Screen Drivers Interface TEMP MUX VREF+ AIN+ SAR ADC AIN- VREF- SPI Serial I/F & Control Logic Internal Osc CSN DIN SCLK DOUT PENIRQN VSS Figure 1. Block Diagram SPITM is a registered trademark of Motorola, Inc. 2010/10 -1- Free Datasheet http://www.Datasheet4U.com 1 page [AK4185] ANALOG CHARACTERISTICS (Ta = -40°C to 85°C, VDD = 1.8V, fSCLK = fs x 16=5.0MHz, 12bit mode) Parameter min typ max Units A/D Converter Resolution - 12 Bits No Missing Codes 11 12 Bits Integral Nonlinearity (INL) Error - - ±2 LSB Differential Nonlinearity (DNL) Error -2 ±1 +3 LSB Offset Error - - ±6 LSB Gain Error - - ±4 LSB Touch Panel Drivers Switch On-Resistance XP, YP (RL=300Ω) XN, YN (RL=300Ω) PENIRQ Pull Up Resistor RIRQ Auxiliary IN Input 2.5 5 15 Ω 2.5 5 15 Ω 30 50 70 kΩ Input Voltage Range 0 VDD V Temperature Measurement Temperature Range -40 85 °C Resolution (Note 4) - 1.2 - °C Accuracy (Note 5) - ±3 - °C Power Supply Current Normal Mode (Internal Oscillator mode) (Note 6) VDD=18V VDD=3.6V - - 240 - μA - 550 μA Normal Mode (Bus clock mode) PD0 = “0” (Note 7) VDD=1.8V VDD=3.6V - - 340 - μA - 800 μA Full Power Down (when writing control command with PD0 = “0”) - 0 3 μA Note 4. “Ideal” value derived from a theory when VDD = 1.8V. This value according to the supplied VDD voltage is 0.6466 x VDD. Note 5. The typical value has +6°C(typ) offset. Note 6. The signal of 1kHz, 1.6Vpp (-1dB) is input to the IN/WIPER pin, when COUNT bit = “0”, INTERVAL = 0µs and command cycle is 50µs. DOUT CL = 0pF, the current of touch panel drivers is excluded. Note 7. The signal of 1kHz, 1.6Vpp (-1dB) is input to the IN/WIPER pin, when Single Mode for external clock (CONTINUE bit = “0”) and 15 SCLK clock cycles. DOUT CL = 0pF, the current of touch panel drivers is excluded. DC CHARACTERISTTICS (Logic I/O) (Ta=-40°C to 85°C, VDD =1.6V to 3.6V) Parameter Symbol min typ max Units Digital Input (CSN, SCLK, DIN) “H” level input voltage VIH 0.8xVDD - -V “L” level input voltage VIL - - 0.2xVDD V Input Leakage Current. IILK -10 10 μA Digital Output (DOUT, PENIRQN) “H” level output voltage (@ Iout = -250μA) VOH VDD-0.4 - -V “L” level output voltage (@ Iout = 250μA) VOL - - 0.4 V Tri-state Leakage Current IOLK All pins except for XP, YP, XN, YN pins XP, YP, XN, YN pins -3 - -3 - 3 μA 3 μA MS0954-E-05 -5- 2010/10 Free Datasheet http://www.Datasheet4U.com 5 Page [AK4185] ■ Temperature Measurement Equation <1> describes the forward characteristics of the diode. ( )VD iD = I0 ⋅ e VT (VT = kT q ) <1> I0: reverse saturation current q: 1.602189×10-19 (electron charge) k: 1.38054×10-23 (Boltzmann’s constant) VD: voltage across diode T: absolute temperature K The diode characteristic is approximately shown as a diode junction voltage. That is theoretically to the temperature; the ambient temperature can be predicated by knowing this voltage. Temp. Sensor I 80 1 TEMP0 TEMP1 Figure 6. Temperature Measurement As the AK4185 has two different fixed current circuits and a diode (temperature sensor), the temperature can be measured by using two different methods. The first method needs two conversions, but can derive the temperature directly without knowing the voltage at a specific temperature. From equation <1> ⎜⎜⎝⎛ i D1 i D0 ⎟⎟⎠⎞ = ⎜⎛ ⎜ ⎜⎜⎝ I 1 I 80 ⎟⎞ ⎟ ⎟⎟⎠ = 80 = ⎪⎧( ⎨ e⎪⎩ V (1)− V (80 ) ) VT ⎪⎫ ⎬ ⎪⎭ T[°C] = ΔVbe ⋅ k ⋅ q In(80) − 273 ΔVbe = V(1)− V(80) T[°C] = 2.648 ×103 × ΔVbe − 273 The second method needs only one conversion as the following equation, but requires knowing the junction voltage at the specific temperature. T = ⎜⎜⎝⎛ k q ⎟⎟⎠⎞ ⋅ VD In⎜⎝⎛ iD I0 ⎟⎠⎞ <2> MS0954-E-05 - 11 - 2010/10 Free Datasheet http://www.Datasheet4U.com 11 Page

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