Cirrus-logic CDB5490U Manuale Utente Scaricare il pdf (Pagina 9)

CDB5490U

DS923DB5 9

1.4 Digital Section

The digital section contains the microcontroller, USB interface, LCD, optical isolation, JTAG header, reset

circuitry, and external interface headers (J17 and J19). The microcontroller interfaces the UART of the

CS5490 with the USB connection to the PC, enabling the GUI software to access all of the CS5490 reg-

isters and functions.

1.4.1 Serial Port Selection

Communication to the CS5490 is provided through a standard UART. It is necessary to establish commu-

nication with the MCU before serial port communication with the CS5490 (see Figure 5).

The CDB5490U board provides two UART communication options - normal speed and low speed. Table 3

provides the serial communication options for the UART.

Table 3. Serial Communication Options

Figure 5. MCU Connection Window

J18 J20 J50

UART

via MCU

Ƒ OPTO

ż RX

ż DIGITAL

(default)

Ƒ OPTO

ż TX

ż DIGITAL

(default)

Ƒ VDDA

ż EN2

ż GND

(default)

Low speed

UART

Ƒ OPTO

ż RX

ż DIGITAL

Ƒ OPTO

ż TX

ż DIGITAL

Ƒ VDDA

ż EN2

ż GND

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Cirrus-logic CDB5490U Manuale Utente Pagina 9