ucb1300 NXP Semiconductors, ucb1300 Datasheet - Page 20

• Manufacturer Part Number: ucb1300
• Description: Advanced Modem/audio Analog Front-end
• Manufacturer: NXP Semiconductors

Philips Semiconductors
The setting of the touch screen bias circuit and the ADC input multiplexer is determined by the setting of TSC_MOD[n]
in the touch screen control register according the following table.
TOUCH SCREEN MODE SELECTION
SUMMARY OF TOUCH SCREEN MODES; note 1
Notes
1. Control register address 9 is used for touch screen mode selection.
2. The powered and grounded touch screen pins may be interchanged.
3. In this mode, the touch screen bias must be disabled by the user to prevent false interrupts.
2000 Jun 26
00
01
1X
X position
Y position
pressure - 1
pressure - 2
pressure - 3
pressure - 4
pressure - 5
X-plate resistance powered
Y-plate resistance
interrupt
TOUCH SCREEN
MEASUREMENT
Advanced modem/audio analog front-end
TSC_MODE[N]
powered
ADC_INPUT[n]
powered
powered
floating
floating
grounded
floating
powered
interrupt
pressure
position
SELECTED BITS
TSPX
(2)
(2)
(2)
grounded
ADC_INPUT[n]
powered
floating
grounded
powered
floating
grounded
floating
powered
resistor to V
touch screen bias circuit
touch screen bias circuit
TSMX
(2)
(2)
(2)
TOUCH SCREEN BIAS
SOURCE
DDA1
ADC_INPUT[n]
powered
grounded
grounded
powered
floating
floating
floating
powered
grounded
20
TSPY
(2)
(2)
(2)
ADC_INPUT[n]
grounded
grounded
floating
floating
grounded
powered
floating
grounded
grounded
defined by ADC_INPUT[n]
touch screen current monitor
defined by ADC_INPUT[n]
TSMY
ADC MULTIPLEXER SETTING
(TOUCH SCREEN INPUTS)
(2)
(2)
(2)
position
position
pressure
pressure
pressure
pressure
pressure
pressure
pressure
interrupt
SCREEN
TOUCH
MODE
Product specification
UCB1300
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
enabled
disabled
SCREEN
TOUCH
BIAS
(3)