P9242-R Datasheet

© 2018 Integrated Device Technology, Inc

18

January 16, 2018

7.9 Q-Factor and LED Pattern Selection – LED/Q-Fact Pin

The P9242-R uses two LEDs to indicate the power transfer status, faults, and operating modes depending on the voltage level at the LED/Q-Fact

pin. In addition, this pin enables or disables the Q-factor used for FOD (see section 7.1). The LEDs are connected to the LED1 and LED2 pins

as shown in the typical application schematic in Figure 25. The LED pattern can be selected and the Q-factor can be enabled or disabled by

the voltage on the LED/Q-Fact pin as determined by the resistor divider R43 and R44 as shown in Figure 25.

Table 9.

Resistors for Setting the LED Pattern and Enabling/Disabling the Q-factor Detection for FOD

Q-Factor

Detection

Option

LED/Q-Fact

Pin Voltage

R43

[kΩ]

R44

[kΩ]

LED1/LED2 Pin

Status

Standby

Transfer

Complete

Fault

Enabled

1

Pull-Down

Open

10

LED2

Off

On

Off

Off

LED1

Off

Off

Off

Blink 4Hz

2

0.225V

10

0.732

LED2

On

On

Off

Off

LED1

On

Off

Off

Blink 4Hz

3

0.375V

10

1.27

LED2

Off

Blink 1Hz

On

Blink 4Hz

LED1

Off

Off

Off

Off

4

0.525V

10

1.87

LED2

Off

On

Off

Blink 4Hz

LED1

Off

Off

Off

Off

5

0.675V

10

2.55

LED2

On

Blink 1Hz

On

Off

LED1

On

Off

Off

Blink 4Hz

6

0.825V

10

3.32

LED2

Off

Off

On

Off

LED1

Off

On

Off

Blink 4Hz

7

Pull-Up

10

Open

LED2

Off

Blink 1Hz

On

Off

LED1

Off

Off

Off

Blink 4Hz

Disabled

1

1.125

10

5.11

LED2

Off

On

Off

Off

LED1

Off

Off

Off

Blink 4Hz

2

1.275

10

6.34

LED2

On

On

Off

Off

LED1

On

Off

Off

Blink 4Hz

3

1.425

10

7.68

LED2

Off

Blink 1Hz

On

Blink 4Hz

LED1

Off

Off

Off

Off

4

1.575

10

9.09

LED2

Off

On

Off

Blink 4Hz

LED1

Off

Off

Off

Off

5

1.725

10

11

LED2

On

Blink 1Hz

On

Off

LED1

On

Off

Off

Blink 4Hz

6

1.875

10

13

LED2

Off

Off

On

Off

LED1

Off

On

Off

Blink 4Hz

7

2.025

10

15.8

LED2

Off

Blink 1Hz

On

Off

LED1

Off

Off

Off

Blink 4Hz