Texas Instruments TPS2149 manual 2. Jumpers and Test Points, Eeprom, 3. QWERTY Keyboard Matrix

Jumpers and Test Points

3.5 Jumpers and Test Points

Table 3–2 describes the jumpers, J1 and J2, used to connect P3.0 and P3.1 to D6 and D7 respectively, which should only be done when P3.0/S0 and P3.1/S1 are not set to GND for VID/PID selection (see the TUSB2136 keyboard hub controller data sheet).

Table 3–2 also describes the various 0-Ω resistors used as jumpers. Test points are located throughout the EVM. For location of these test points, consult the layout in Section 5.

Table 3–2. Jumpers and Test Points

Jumpers	Description
J1	Installed: connects P3.1 to D7
J2	Installed: connects P3.0 to D6
R30 thru R35	0-Ω resistors used to configure the TUSB2136. For proper operation with the firmware and
	EVM, R30, R31, and R33 are installed at the factory.
R29, R36, R37, R38	0-Ω resistors on power lines which may be removed to insert a current meter.

3.6

EEPROM

The EEPROM is used for application-specific firmware. The TUSB2136 will

automatically read the EEPROM at power up via the I2C bus. A header must

be added to the application firmware before loading into the EEPROM. This

header format is specified in the bootcode document provided with the

TUSB2136. The header may be generated automatically with the I2C header

generation utility software also provided with the TUSB2136.

For convenience, the EEPROM has been installed on a socket. If desired, the

socket may be removed and the EEPROM can be soldered directly onto the

board. Using J3 and J4, the firmware installed at the factory will support a

QWERTY keyboard with the matrix shown in Table 3–3.

Table 3–3. QWERTY Keyboard Matrix

Port

Matrix

P3.6

P0.6

P0.7

P0.4

P0.5

P0.2

P0.3

P0.0

P0.1

P1.6

No.

COL 1

COL 2

COL 3

COL 4

COL 5

COL 6

COL 7

COL 8

COL 9

COL 10

P2.7

ROW 1

Q

9

A

6

Z

3

DEL

P2.6

ROW 2

W

8

S

5

X

2

0

P2.5

ROW 3

E

7

D

4

C

1

INS

P2.4

ROW 4

R

ESC

F

HOME

V

END

R ARROW

P2.3

ROW 5

T

I

G

K

B

/

SPACE

P2.2

ROW 6

Y

P

H

“

N

U ARROW

D ARROW

P2.1

ROW 7

U

O

J

L

M

\

L ARROW

P2.0

ROW 8

–

,

+

ENTER

.

SHIFT

ALT

CTL

EVM Operation 3-3