Texas Instruments TSC2007EVM-PDK manual Digital Interface, Power Supplies, TSC Power

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Digital Interface

3Digital Interface

The TSC2007EVM is designed to easily interface with multiple control platforms. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row header/socket combination at J2. This header/socket provides access to the digital control and serial data pins of the TSC. Consult Samtec at www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options.

		Table 3. Digital Interface Pinout
PIN NUMBER	SIGNAL	DESCRIPTION
J2.15	PENIRQ	Pen Interrupt Output from TSC
J2.16	SCL	I2C™ bus serial clock
J2.4, J2.10, J2.18	DGND	Digital ground
J2.1-J2.19 (odd, except	Unused
J2.15)
J2.20	SDA	I2C bus data line

4Power Supplies

J3 provides connection to the common power bus for the TSC2007EVM. Power is supplied on the pins listed in Table 4.

Table 4. Power Supply Pinout

SIGNAL		PIN NUMBER	SIGNAL
Unused	1	2	Unused
Unused	3	4	Unused
DGND	5	6	AGND
+1.8VD	7	8	Unused
+3.3VD	9	10	Unused

When power is supplied to J3, JMP1 allows for one of two different DC voltages to be selected as power for the TSC. See the schematic and PCB silkscreen for details.

The TSC2007EVM-PDK motherboard (the USB-MODEVM interface board) supplies power to J3 of the TSC2007EVM. Power for the motherboard is supplied either through its USB connection or via terminal blocks on the board.

4.1TSC Power

Power for the TSC2007 VCC can be supplied either from the +1.8VD terminal or from the +3.3VD terminal. JMP1 selects which of these voltages is routed to the TSC2007. When JMP1 is in the default factory condition (shunt on pins 2-3), power to the TSC comes from J3.9 (+3.3VD). When the shunt is installed on JMP1 pins 1-2, power comes from J3.7 (+1.8VD). Removing the shunt on JMP1, the user can connect any DC power supply between 1.2VD and 3.6VD to VCC by connecting the power to JMP1 pin 2.

Table 5. Power Selection Options - JMP1

SHUNT ON PINS	VDD	VOLTAGE FROM J3 PIN
1-2	+1.8VD	7
2-3	+3.3VD	9
Removed	+1.2VD and +3.6VD	External

SLAU199 –March 2007	TSC2007EVM and TSC2007EVM-PDK User's Guide	3
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