
TS-7250 MANUAL
COMMON INTERFACES GENERAL INFORMATION
Many of the DIO pins (DIO_0 thru DIO_8 and LCD_0 thru LCD_7) can also be
programmed to cause interrupts. The interrupt properties of these pins are individually
configurable. Each interrupt can be either high or low level sensitive or either rising or
falling edge triggered. It is also possible to enable debouncing on any of these interrupts.
Debouncing is implemented using a 2-bit shift register clocked by a 128 Hz clock. Refer to
the
EP9301 User's Guide
and see Chapter 21 for details
The 5V power output pin on the LCD Header is current limited to 1000mA to prevent
excessive current. The 3.3V power on the DIO1 Header is current limited to approximately
1 Amp by a 3.3V regulator.
4.3 A/D Converters
The EP9302 A/D converter is standard on all
TS-7250
boards
.
The Cirrus EP9302
features a 5 channel, 12-bit Analog to Digital Converter with an analog multiplexor, with an
input range of 0 to 3.3 V.
On the
TS-7200,
only the top and bottom channels (ADC0 and ADC4) are brought out on
the DIO1 Header. On the
TS-7250
, the dedicated A/D Header brings out all the 5 EP9302
A/D channels. The
TS-7260
uses 3 of the 5 EP9302 A/D channels for on-board
measurements, therefore only 2 channels are available on the DIO2 Header.
The
TS-7200
and
TS-7250
support an optional 8 channel, 12-bit A/D converter (ADC) with
a conversion time of 12 uS through the MAX 197 chip. This will allow up to 60,000
samples per second. The dedicated MAX197 A/D Header brings out all the 8 A/D
channels.
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