Reference Design

IRMCS2013

This document is the property of International Rectifier and may not be copied or distributed without expressed consent.

19

9. Appendix

9.1 External I/O

Connect External I/O Connector (J7) as needed. All inputs are 5V tolerant and high true logic.

Pin definition

Pin 1: Analog input (+/-10V)

Pin 2: Analog GND

Pin 3: Digital GND

Pin 4: FAULT status output (3.3V when FAULT)

Pin 5: SYNC status output (3usec width of active low

pulse at every carrier frequency period)

Pin 6: PWMACTIVE output (3.3V when PWM active)

Pin 7: +5V

Pin 8: START input (high to activate)

Pin 9: STOP input (high to activate)

Pin 10: Ifb offset calibration input (high to activate)

Pin 11: Fault Clear input (high to activate)

Pin 12: Digital GND

Figure 14. External I/O Connector, J6

9.2 RS232C Connector

IRMCS2013 has two serial RS232C connectors on the board. J4 is for IRMCK201 and J5 is for Microchip IC

(U19). Adaptation from D-sub 9 pin standard PC female connector to AMP 3 pin connector are required to be

directly connectable to PC serial port. As shown in Figure 15, pin 1 is send-signal and pin 2 is receive-signal, and

both are 10V signal level. The baud rate is fixed at 57.6 kbps. The signal format is 8 bits, no parity, 1 stop bit.

Figure 15. RS232C Connector, J4

GND

GND

5V

GND

12

11

2

1

J6 Top View

FLTCLR

START

STOP

IFBCAL

User supplied

power supply

GND

-10V +10V

10k ohm

potentiometer

Tx

Rx