Datasheet

Device Characteristics
1-2
1.1 Device Characteristics
The TSC2101 is a complete PDA analog interface circuit. It contains a
complete 12-bit A/D resistive touch screen converter, including the drivers and
the control to measure touch pressure. The TSC2101 interfaces to the host
controller through a standard SPI serial interface. The TSC2101 offers two
auxiliary analog inputs and one battery voltage measurements. The battery
measurement is capable of reading battery voltages up to 6 V, while operating
with only a 2.7-V supply. It also has an on-chip temperature sensor capable
of reading 1°C resolution.
In addition to these features, the TSC2101 has a high performance audio
codec. Access to the audio DAC and ADC sections of the TSC2101 is through
an I
2
S interface. For more detail about TSC2101 device, refer to the TSC2101
data sheet.
1.2 EVM Block Diagram
A block diagram of the TSC2101 evaluation kit is shown in Figure 1−1.
Figure 1−1. TSC2101 Evaluation Kit Block Diagram
Analog Audio
I2SSPI
TSC2101
External SPI
External I2S
Buffer
Buffer
SW2
5
4
TAS1020B
(USB Controller)
EEPROM
2
Firmware Storage
USB
2
Voltage
Regulators
2.5 mm
6−10 Vdc
3.3 V
3.3 VA
3.9 V
J12J11
J10
J14
J13
I2C
4
3
Y−
J1
X+
Y+
X−
J3
J4
J5
GND
GND
VBAT
AUX1
AUX2
VREF
Touch ScreenExternal InputsExternal Ref
J6
J7
J8
OUT32
J9
Loud Speaker
Onboard
MIC
MK1
External MICIN
Headset
OUT8
SW1
GND
J2
BUZ_IN
CP_OUT
CP_IN
1.8 V
The digital control interface is through either the USB bus or an external SPI
bus, selectable through the SW2. While the SW2 is not at the USB-controlled
position, the onboard SPI bus from the onboard microprocessor is disabled,
allowing the external SPI bus to control the TSC2101.