PDF SH1412 Data sheet ( Hoja de datos )

Número de pieza	SH1412
Descripción	Capacitive Touchpad Controller
Fabricantes	Semtech
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No Preview Available ! SH1412 Capacitive Touchpad Cwwown.DtartaoShleleet4rU.com for Notebook Applications HID & SYSTEM MANAGEMENT PRODUCTS DESCRIPTION The SH1412 capacitive touchpad controller uses advanced capacitive position and motion sensing algorithms. Just a few low- tolerance external components are needed. The touchpad follows the industry standard of using multiple lines to detect the presence of a user’s finger. Once a finger is in close proximity to the touchpad, its position is calculated along with its pressure on the touchpad surface. Sophisticated algorithms filter out any noise from the finger, or from other sources, such as cell phones. FEATURES • Light touch and precise control • Industry-standard PS/2 interface • Up to 3 buttons for touchpad features • Full wheel mouse support • Highly resistant to EMI and RFI noise • > 500 DPI resolution APPLICATIONS • Notebooks/laptops • Consumer products • Portable/handheld computers PIN ASSIGNMENTS • 80 reports per second • 5 V operating voltage at 4 mA • Ideal for Chinese character input • Protected by issued and pending US and international patents • Low-tolerance components; Y5V capacitors and 5% resistors • 32-pin LQFP package • Keyboards • Instrumentation The SH1412 appears to the host system as a standard three-button mouse; no special driver is required. If the Semtech driver is used, more advanced functions such as edge motion, gestures, and wheel functionality are available. Typically consuming less than 4 mA, the SH1412 is ideal for battery-operated systems. PS/2® communication is bidirectional at 10 kbps. The SH1412 returns up to 100 mouse reports per second, and is compatible with the standard two-button mouse protocol and the standard three-button mouse protocol. It implements all commands from and to the system (as defined in the IBM® PS/2 mouse communication protocol). 24 25 C_EN CNF1 F_DA A_CLMP SW_PWR SW_PWR AD R 32 1 SH1412-FGT LQFP 17 16 9 8 PS2C PS2D NMB NLB NRB VSS _XOUT XIN Semtech and the Semtech logo are marks of Semtech Corporation. IBM and PS/2 are marks of IBM Corporation. All other marks belong to their respective owners. Copyright ©1999-2005 Semtech Corporation SH1412 data sheet v1.06 (2005-05-02) 1 www.semtech.com 1 page SH1412 www.DataSheet4U.com PS2 COMMUNICATION At start-up or reset, the SH1412 waits between 300 and 500 milliseconds, then sends 0xAA to the host, followed by a device ID of 0x00. Then the SH1412 sets itself to its default values, i.e., incremental stream mode with 1:1 scaling, and a report rate of 100 Hz. The SH1412 then disables itself until it receives a command from the host. PS/2 LEGACY REPORTS The adjacent table shows the PS/2 legacy report format. In the data report, each of the two position values (X and Y) is expressed as a 9-bit two's complement integer with the most significant bit (the sign bit) stored separately in byte 1. If there is an overflow of the accumulator, the maximum positive or negative count is reported and the corresponding overflow bit is set. PS/2 ERROR HANDLING For every correct command or parameter received from the host, the SH1412 sends an acknowledge (0xFA). If an invalid command or parameter is received, the SH1412 issues a resend request (0xFE). If an invalid input is again received, the device transmits an error code (0xFC) to the host. Both error and resend request responses are sent by the device within 25 milliseconds. The host may not issue any new commands until either the SH1412 has responded or 25 milliseconds have elapsed. PS2 LEGACY DATA REPORT Byte 1 b0 b1 b2 b3 b4 b5 b6 b7 Byte 2 b0 b1 b2 b3 b4 b5 b6 b7 Byte 3 b0 b1 b2 b3 b4 b5 b6 b7 Left button status Right button status Middle button status 1 X8 MSb of X data, sign bit Y8 MSb of Y data, sign bit X data overflow Y data overflow X0 LSb of X data X1 X2 X3 X4 X5 X6 X7 Y0 LSb of Y data Y1 Y2 Y3 Y4 Y5 Y6 Y7 STANDARD PS/2 STATUS REPORT Byte 1 b0 b1 b2 b3 b4 b5 b6 b7 Byte 2 b0 - 1 b2 - 7 Byte 3 b0-7 Right button Middle button Left button 0 Scaling Disable Stream 0 Current resolution setting 0 Current sampling rate 1 = depressed 1 = depressed 1 = depressed Always = 1 1 = negative 1 = negative 1 = overflow 1 = overflow 1 = depressed 1 = depressed 1 = depressed Always = 0 1:1 (0) / 2:1 (1) (0) / enable (1) (0) / prompt (1) mode Always = 0 Always = 0 Copyright ©1999-2005 Semtech Corporation SH1412 data sheet v1.06 (2005-05-02) 5 www.semtech.com 5 Page SH1412 www.DataSheet4U.com SH1412-FGT BILL OF MATERIALS FOR APPLICATION CIRCUIT SH1412-FGT BOM Designator Y1 U1 U2 U3 U4 U5 U6 U7,U8 R1 R2,R8 R3 R4 R9 R10 R11 R12 R13,R14 R15 C1 C2,C3,C4 C5,C6 C7 C8,C10 C11 Description 4.00 MHz resonator with caps SH1412 touchpad controller MicroPower voltage regulator Dual analog multiplexer Single operational amplifier Quad 2-input NAND gate Triple 2 ch analog multiplexer 16 ch analog multiplexer Chip resistor Chip resistor Chip resistor Chip resistor N/U Chip resistor N/U Chip resistor N/U Chip resistor Chip resistor Chip resistor Chip resistor Chip capacitor Chip capacitor Chip capacitor Chip capacitor Chip capacitor Chip capacitor Value 4.00 Mhz 4.2-4.5 V 62 Ω 100 KΩ 10 KΩ 910 KΩ 180 Ω 15 KΩ 330 KΩ 1 µF 0.1 µF 10 µF 2200 pF 220 pF 0.01 µF Tolerance Package ± 5% ± 5% ± 5% ± 5% ± 5% ± 5% ± 5% ±10% ± 10% +80%/-20% NPO or COG ± 5% ± 10% LQFP-32 SOT-23-5 SSOP-8 SOT-23-5 TSSOP-14 TSSOP SSOP-24 0402 0402 0402 0402 0402 0402 0402 0402 0402 0402 0603 0603 1206 0603 0603 0603 Mfg. Murata Semtech Torex TI National TI TI TI Generic Generic Generic Mfg. P.N. CSTCR4M00G53 SH1412-FGT XC6204 SN74LVC2G53DCTR LMV321M5X CD74HC00M96 CD74HC4053PWR CD74HC4067SM96 Generic Generic Generic Generic Generic Generic Generic Generic Generic Generic Note: Resistors R9 and R10, unused in the application circuit, allow for a variety of voltage regulator ICs to be installed at location U2, utilizing exactly the same PCB footprint. Copyright ©1999-2005 Semtech Corporation SH1412 data sheet v1.06 (2005-05-02) 11 www.semtech.com 11 Page

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