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SS7646 датащи(PDF) 6 Page - Silicon Standard Corp. |
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SS7646 датащи(HTML) 6 Page - Silicon Standard Corp. |
6 / 13 page www.SiliconStandard.com 4 of 5 SS7646 8/21/2004 Rev.2.01 The Control Byte : Table I and Table II show detailed information of the control byte (on DIN). The control byte provides the start operation, addressing, resolution, reference and power down information to the SS7646. Start Bit – Initiate Start The control byte starts with the first high bit on DIN. The first bit must always be HIGH (1) to initiate the start of the conversion. The SS7646 will ignore any inputs on the DIN until the start bit is detected. Addressing Bits – Input Channel Selection The next three bits on control byte (A2, A1, A0) select the active input channel of the input multiplexer (see Table III, and Figure 5), and touch screen drivers. Mode Bits – Resolution and Reference Configuration The Mode bits (Mode1, Mode0) set the resolution of the analog-to-digital (ADC) converter. 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. The MODE0 bit set the reference input of the ADC (see Reference Input section and Figure 5). Table IV shows detailed i nformation of the Mode Bits. PD0 and PD1 Bits - Power Down Control The last two bits (PD1, PD0) control the power-down mode and pen interrupt request of the SS7646. If both bits are HIGH (1), the ADC is always powered up and pen interrupt will be disabled. If both bits are LOW (0), the ADC enters a power-down mode between conversions. The internal 2.5V voltage reference can be turned ON or OFF independently of the ADC with the PD1 bit. See Table V for more information. A2 A1 A0 Measure Input Channel X Switch Y Switch 0 0 1 Y-POSITION X+ OFF ON 1 0 1 X-POSITION Y+ ON OFF 0 1 1 Z1-POSITION X+ X- ON Y+ ON 1 0 0 Z2-POSITION Y- X- ON Y+ ON 0 1 0 Battery VBAT OFF OFF 1 1 0 Auxiliary VIN OFF OFF 0 0 0 TEMP0 - OFF OFF 1 1 1 TEMP1 - OFF OFF Table III. Input Channel Configuration Operation of 16-Clocks The typical operation of the SS7646 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. Operation of 15-Clocks The fastest operation (15-clocks per conversion) of SS7646 is shown on Figure 4. This operation will not wo r k wi th t he s e r i a l i nte r f a c e of m o s t microcontrollers and digital signal processors, as they are not capable of providing 15 clocks cycles per serial transfer. MODE1 MODE0 Resolution ADC Reference 0 1 12bits VREF 0 0 12bits VDD * 1 1 8bits VREF 1 0 8bits VDD * Table IV. Resolution and Reference Configuration * When measuring Y(001), X(101), Z1(011) and Z2(100) positions, otherwise Invalid configuration PD1 PD0 /PENIRQ DESCRIPTION 0 0 Enable The reference is switching OFF and the ADC will powerdown betweenconversions. Y- switch is on while in power-down. 0 1 Enable The reference is switching OFF and the ADC is ON permanently. No power down between conversions. 1 0 Enable The reference is ON and the ADC will power down between conversions. 1 1 Disable The reference and the ADC are ON. No power down between conversions, the ADC always power up. The pen interrupt functionality will be disabled. Table V . Power-Down and Pen Interrupt Selection |
Аналогичный номер детали - SS7646 |
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Аналогичное описание - SS7646 |
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