MAX3100EVKIT+【PDF 5/12 页】KIT EVAL FOR MAX3100

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MAX3100 Evaluation Kit

Detailed Description of Hardware

The MAX3100 EV kit uses the MAXQ2000-RAX as a

host μC to communicate with the MAX3100 through the

SPI interface. The μC converts received characters to a

seven-segment LED display. The μC also implements a

master I 2 C-compatible interface to communicate with

the on-board MAX6626 temperature sensor.

The EV kit has a MAX3232 RS-232 transceiver to facili-

tate communication with a PC.

The EV kit is designed as a DCE device. The J1 female

DB9 connector pin functions are shown in Figure 2. EV

kit TX line is connected to PC RX line. EV kit RX line is

connected to PC TX line. EV kit RTS line is connected to

PC CTS line. EV kit CTS line is connected to PC RTS line.

The data communication between the EV kit and the PC

only requires TX and RX lines.

The logic of the RTS line (J2, pin 4) on the EV kit is con-

trolled by the MAX3100’s RTS configuration bit. RTS = 1

sets the RTS line to logic 0. RTS = 0 sets the RTS line to

logic 1. The logic of the CTS line (J2, pin 5) on the EV

kit is controlled by the PC ’s hardware flow control

(MAX3100’s CTS = 0, D3 = On; MAX3100’s CTS = 1,

D3 = Off).

Figure 2. EV Kit J1 Female DB9 Connector Pin Functions

MAX3100 Baud Rate Generation

Bits B3–B0 in the MAX3100 write-configuration register

determine the baud-rate divisor (BRD), which divides

the X1 oscillator frequency. The MAX3100 internal oscil-

lator operates with either a 1.8432MHz or a 3.6864MHz

crystal, or is driven at X1 with a 45% to 55% duty-cycle

square wave. The MAX3100 IC data sheet shows BRDs

for given input codes, as well as the baud rate for

1.8432MHz and 3.684MHz crystals. The generator’s

clock is 16 times the baud rate.

On the EV kit board, a 3.684MHz crystal is installed. A

user can replace it with a 1.8432MHz crystal or remove

Y1 and apply an external square wave on the EXTERNAL

CLOCK pad.

A user should first set B3–B0 bits to the desired values

on SW6 and then press and release SW1 to configure

the MAX3100 BRD.

Hardware Reset

Press SW4 on the EV kit to reset the μC and the

MAX3100 to its initial power-on-reset (POR) state.

Jumper and Switch Settings

See Tables 1, 2, and 3 for a description of the EV kit

jumpers and switch settings.

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