參數(shù)資料
型號： TPS650732TRSLRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PQCC48
封裝： 6 X 6 MM, 0.4 MM PITCH, GREEN, PLASTIC, QFN-48
文件頁數(shù)： 30/90頁
文件大?。?/td> 1375K
代理商： TPS650732TRSLRQ1
X-Plate
Y-Plate
TSX1
TSX2
TSY1
TSY2
RX1
RX2
RY1
RY2
Rcontact
SLVSAP7 – JANUARY 2011
www.ti.com
is connected to pin BYPASS. The pin can be used as a reference output with a maximum output current of
0.1mA. The internal reference voltage is forced to be on when the ADC or the touch screen interface is enabled.
The reference voltage can additionally forced to be on using Bit Vref_enable in register ADCONFIG while ADC
and touch screen are off to allow external circuits to be supplied with a precise reference voltage while ADC and
touch screen are not used.
Touch Screen Interface
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 35. The points shown in the diagram as TSX1, TSX2, TSY1 and
TSY2 are connected to the 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.
Figure 34. 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 2. The touch screen
controller uses transfer gates to the internal ADC on input channels AD_IN14 and AD_IN15.
Table 2. TSC Modes
CONTROL MULTIPLEXER
CONNECTIONS
MODE
MEASUREMENT
TSC_M2
TSC_M1
TSC_M0
TSX1
TSX2
TSY1
TSY2
0
TSREF
GND
ADC_IN3
ADC_IN4
X-Position
Voltage TSY1
PMOS
NMOS
TGATE
0
1
ADC_IN1
ADC_IN2
TSREF
GND
Y-Position
Voltage TSX1
TGATE
PMOS
NMOS
0
1
0
TSREF
GND
Pressure
Current TSX1 and TSX2
NMOS
0
1
TSREF
GND
HiZ
Plate X
Current TSX1
PMOS
NMOS
Reading on ADC_IN14
1
0
HiZ
TSREF
GND
Plate Y
Current TSY1
PMOS
NMOS
Reading on ADC_IN14
1
0
1
TSREF
GND
TSC standby
Voltage TSX1 and TSX2
TGATE
NMOS
36
Copyright 2011, Texas Instruments Incorporated
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