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ZHCSI59I July 2009 – May 2018 TPS65070 , TPS65072 , TPS65073 , TPS650731 , TPS650732

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.

封裝選項

機械數據 (封裝 | 引腳)

RSL|48
- MPQF193B

散熱焊盤機械數據 (封裝 | 引腳)

RSL|48
- QFND160L

訂購信息

10.3.13.4 Touch Screen Interface (only for TPS65070, TPS65073, TPS650731, TPS650732)

The touch screen itself consists of two parallel plates, called the X and Y plates, separated by short distance; contact is initiated by using a stylus or your finger. This action creates a series of resistances noted by RX1, RX2, RY1, RY2 , and Rcontact, shown in Figure 36. The points shown in the diagram as TSX1, TSX2, TSY1 and TSY2 are connected to the TPS6507x touch screen interface. The resistances RX1 and RX2 scale linearly with the x-position of the point of contact, where the RY1 and RY2 resistances scale with the y-position. The Rcontact resistance decreases as the pressure applied at the point of contact increases and increases as the pressure decreases. Using these relationships, the touch screen interface can make measurements of either position or pressure.

TPS65070 TPS65072 TPS65073 TPS650731 TPS650732 touch_sc_lvs950.gif

Figure 35. Touch Screen

The touch screen interface consists of a digital state machine, a voltage reference, and an analog switch matrix which is connected to the four wire resistive touch screen inputs (TSX1, TSX2, TSY1, TSY2) and an internal 10-Bit ADC. The state machine controls the sequencing of the switch matrix to cycle through the three types of measurement modes (position, pressure, plate resistance) and the low power standby mode. The separate internal voltage reference (TSREF) is disabled in standby and off modes. The voltage is generated by an internal LDO. Its voltage is bypassed by a capacitor connected to pin INT_LDO. The state of the touch screen is controlled by the TSC_M[2,0] Bits of the TSCMODE register (08h) as shown in Table 3. The touch screen controller uses transfer gates to the internal ADC on input channels AD_IN14 and AD_IN15.

Table 3. TSC Modes

CONTROL MULTIPLEXER			CONNECTIONS				MODE	MEASUREMENT
TSC_M2	TSC_M1	TSC_M0	TSX1	TSX2	TSY1	TSY2	MODE	MEASUREMENT
0	0	0	TSREF PMOS	GND NMOS	ADC_IN3 TGATE	ADC_IN4 TGATE	X-Position	Voltage TSY1
0	0	1	ADC_IN1 TGATE	ADC_IN2 TGATE	TSREF PMOS	GND NMOS	Y-Position	Voltage TSX1
0	1	0	TSREF	TSREF	GND NMOS	GND NMOS	Pressure	Current TSX1 and TSX2
0	1	1	TSREF PMOS	GND NMOS	HiZ	HiZ	Plate X Reading on ADC_IN14	Current TSX1
1	0	0	HiZ	HiZ	TSREF PMOS	GND NMOS	Plate Y Reading on ADC_IN14	Current TSY1
1	0	1	TSREF TGATE	TSREF TGATE	GND NMOS	GND NMOS	TSC standby	Voltage TSX1 and TSX2
1	1	0	A/D TGATE	A/D TGATE	A/D TGATE	A/D TGATE	A/D	ADC used as stand alone ADC using its analog inputs
1	1	1	OPEN	OPEN	OPEN	OPEN	Disabled (no interrupt)	None

If the Touch screen multiplexer is set to disabled mode [111], touch to the screen will not be detected. Standby mode is entered by setting TSC_M[2:0] to 101. When there is a touch, the controller will detect a change in voltage at the TSX1 point and after a 8ms deglitch the INT pin will be asserted if the interrupt is unmasked in register INT. Once the host detects the interrupt signal, will enable the ADC converter and set the TSC_M<2:0> through the I²C bus to select any of five measurements (position, pressure, plate) as shown in Table 4.

Table 4. TSC Equations

MEASUREMENT	CHANNEL	EQUATION
X Plate resistance	AD_IN14	Rx = VTSREF/ [(V_ADC / 22k) × 150]
Y plate resistance	AD_IN14	Ry = VTSREF / [(V_ADC / 22k) × 150]
X position	AD_IN14	X_pos = R_x2 / (R_x1 + R_x2) = R_x2 / Rx R_x2 = V_ADC x R_x/ VTSREF; R_x1 = Rx – R_x2 X_pos = ADRESULT / 1024
Y position	AD_IN14	Y_pos = R_y2 / (R_y1 + R_y2) = R_y2 / Ry R_y2 = V_ADC x R_y/ VTSREF; R_y1 = Ry – R_y2 Y_pos = ADRESULT / 1024
Pressure	AD_IN14	Rc = R – R_x1//R_x2 – R_y1//R_y2 R = VTSREF/ [(V_ADC / 22k) × 150] R_x1//R_x2 = Rx × X_pos × (1 – X_pos) R_y1//R_y2 = Ry × Y_pos × (1 – Y_pos)