Datasheet

Device Characteristics
1-2
1.1 Device Characteristics
The TSC2100 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 TSC2100 interfaces to the host
controller through a standard SPI serial interface. The TSC2100 offers two
battery measurement inputs 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 TSC2100 has audio playback and record
capabilities. Access to the DAC and ADC sections of the TSC2100 is through
an I
2
S interface.
1.2 EVM Block Diagram
A block diagram of the TSC2100 evaluation kit is shown in Figure 1−1.
Figure 1−1. TSC2100 Evaluation Kit Block Diagram
TAS1020B
(MCU and
USB Controller)
J10
4
5
3
4
3.3 V
VREG
12
J11
1211
I2S AUDIO
12
J12
109 EXT SPI
USB
J9
6−12 VDC
SPI I2S
AUDIOANALOG
J6
HEADPHONE OUT
J7
OUT
J5
MIC IN
J1
X−
Y+
X+
Y−
VB1
VB2
AUX
GND
J3
TSC2100
MICIN
On-Board MK1
J2
2
I
2
C
EEPROM
Store
Firmware
for TAS1020B
6−10 VDC
2.5 mm
J8
Buffer
Buffer
SW1
J4
V
ref
External V
ref
The digital control interface is through either the USB bus or an external SPI
bus. The onboard microprocessor can be disabled, allowing the external SPI
bus to control the TSC2100.
Power supplies are derived from the USB bus, or may be provided to the kit
through external connectors from an external user-supplied laboratory power
supply.