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Appendix D Daughterboard Controllers 111

Supplying Power to the Daughterboard Controller

The host system provides the power to the Daughterboard controller.

The controller requires 70 mA (typical), 85 mA (maximum supply

current), at +5 volts DC, +5% regulation, and 100 mV maximum

ripple and noise.

Electrical Specifications for Transmit and Receive

Table 23 lists the D.C. characteristics for the universal asynchronous

receiver transmitter (UART). Specifically, these electrical

specifications are for Pin 13, RXD (data from host) and Pin 14, TXD

(data to host) on the male connector on the Daughterboard controller.

Table 23. D.C. Characteristics

Symbol Description Min Max Units Test Conditions

Output Low Voltage 0.3

0.45

1.5

= 200 µA

= 3.2 mA

= 7 mA

Output High Voltage V

– 0.3

– 0.7

– 1.5

= –200 µA

= –3.2 mA

= –7 mA

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MicroTouch Systems FPD Touch Monitor Especificações Página 111