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TUSB2136PM датащи(PDF) 45 Page - Texas Instruments

номер детали TUSB2136PM
подробное описание детали  UNIVERSAL SERIAL BUS KEYBOARD HUB CONTROLLER
PDF  50 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

TUSB2136PM датащи(HTML) 45 Page - Texas Instruments

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4–1
4 Application
4.1
Keyboard Section
Table 4–1 outlines the GPIO assignment for the switch-matrix scanning and for keyboard LED drive. Figure 4–1
illustrates the port-3 pins that are assigned to drive the four keyboard LEDs. As shown, P3[5:2] can sink up to 12 mA
(open-drain output) on each pin. Figure 4–2 illustrates the 18 outputs (open-drain) and the 8 inputs (internal pullups)
that are used for the switch-matrix scanning. Figure 4–3 illustrates the partial connection bus power mode. Figure
4–4 shows the USB upstream connection, and Figure 4–5 illustrates the downstream connection (only one port
shown).
Table 4–1. GPIO Assignment for Matrix Scan and LED Drive
GPIO
I/O
P0[7:0]
O
8-bit matrix-scan outputs
P1[7:0]
O
8-bit matrix-scan outputs
P3.6
O
1-bit matrix-scan output
P3.7
O
1-bit matrix-scan output
P2[7:0]
I
8-bit matrix-scan inputs
P3.2
O
Keyboard LED-1
P3.3
O
Keyboard LED-2
P3.4
O
Keyboard LED-3
P3.5
O
Keyboard LED-4
P3.0
I/O
GPIO (Not used for keyboard)
P3.1
I/O
GPIO (Not used for keyboard)
TUSB2136
P3.2
P3.3
P3.4
P3.5
VCC
Figure 4–1. Keyboard LED Connection



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