MAX3223EEVKIT データシートの表示（PDF） - Maxim Integrated

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MAX3223EEVKIT

MAX3223E Evaluation Kit

Maxim Integrated 

MAX3223E Evaluation Kit

Table 1. MAX3223E EV Kit Jumper Descriptions (JU1–JU11)

JUMPER

SIGNAL

SHUNT

POSITION

DESCRIPTION

1-2

EN = VCC

JU1

EN

2-3*

EN = GND

1-2*

FORCEON = VCC

JU2

FORCEON

2-3

FORCEON = GND

1-2*

FORCEOFF = VCC

JU3

FORCEOFF

2-3

FORCEOFF = GND

1-2*

INVALID drives LED2

JU4

INVALID

Open

INVALID is not connected to LED2

1-2*

R2IN is driven by DTRIN from connector J1

JU5

R2IN

2-3

R2IN is driven by RTSIN from connector J1

Open

R2IN is not connected to J1

1-2*

DCDOUT drives DTRIN from connector J1

JU6

DCDOUT

2-3

DCDOUT drives T2OUT from U1

1-2*

DSROUT drives DTRIN from connector J1

JU7

DSROUT

2-3

DSROUT drives T2OUT from U1

1-2*

CTSOUT drives RTSIN from connector J1

JU8

CTSOUT

2-3

CTSOUT drives T2OUT from U1

T1IN

JU9

Loopback

1-2

T1IN is driven by R1OUT from U1. Data received from RS-232 side loops back at

digital connection.

Open* T1IN is not connected to R1OUT

JU10

T2IN

Loopback

1-2

Open*

T2IN is driven by R2OUT from U1. Handshake received from RS-232 side loops

back at digital connection.

T2IN is not connected to R2OUT

JU11

RS232

Loopback

1-2

Open*

R1IN is driven by T1OUT from U1. Data received from digital side loops back at

RS-232 connection.

R1IN is not connected to T1OUT

*Default position.

6) Install a shunt across jumper JU1 pins 2-3 to

enable normal operation.

7) Enable the 3.3V DC power supply.

8) Connect the microcontroller’s 3.3V bus to the EV kit

header’s H3 VCC (H3-1) pin.

9) Connect the microcontroller’s UART RXD input to

the EV kit header’s H3 R1OUT (H3-2) output.

10) Connect the microcontroller’s UART TXD output to

the EV kit header’s H3 T1IN (H3-3) input.

11) Connect the microcontroller’s ground return to the

EV kit header’s H3 GND (H3-6) pin.

12) In the RealTerm window, click in the display area

and type on the keyboard. Characters typed from

the keyboard are sent to the microcontroller UART.

Characters sent by the microcontroller UART are

displayed in the terminal window.

Detailed Description of Hardware

The MAX3223E EV kit provides a proven layout for the

MAX3223E. Capacitors C1–C4 are used by the charge

pump to generate the internal V+ and V- supplies from

VCC. Capacitors C5 and C6 bypass the VCC supply.

Header H3 provides the digital connections to the

MAX3223E. Jumpers JU1, JU2, and JU3 control the

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