P9235A-R Datasheet

© 2016 Integrated Device Technology, Inc

14

May 17, 2016

Table 8. LEDs indication table pattern

Current

Sense

Resistor

Option

Number

Voltage

on

LED_PA

T pin[V]

Resistor Divider Values

(Input voltage: LDO18)

LED #/Color

Operational Status

[R27]

[R31]

Standby

Transfer

Complete Fault

20 mΩ

1

Pull down

<0.037 V

NP

47 kΩ,1%

LED1-Green

Off

On

Off

Off

LED2-Red

Off

Off

Off

Blink 4

Hz

20 mΩ

2

0.11 V

715 kΩ,1%

47 kΩ,1%

LED1-Green

On

Off

Off

Off

LED2-Red

On

Off

Off

Blink 4

Hz

20 mΩ

3

0.18 V

422 kΩ,1%

47 kΩ,1%

LED1-Green

Off

Blink 1 Hz

On

Blink 4Hz

LED2-Red

-

-

-

-

20 mΩ

4

0.26 V

280 kΩ,1%

47 kΩ,1%

LED1-Green

Off

On

Off

Blink 4

Hz

LED2-Red

-

-

-

-

20 mΩ

5

0.33 V

210 kΩ,1%

47 kΩ,1%

LED1-Green

On

Blink 1Hz

On

Off

LED2-Red

On

Off

Off

Blink 4

Hz

20 mΩ

6

0.41 V

160 kΩ,1%

47 kΩ,1%

LED1-Green

Off

Off

On

Off

LED2-Red

Off

On

Off

Blink 4

Hz

50 mΩ

7

0.63 V

86.6 kΩ,1%

47 kΩ,1%

LED1-Green

Off

On

Off

Off

LED2-Red

Off

Off

Off

Blink 4

Hz

50 mΩ

8

0.71 V

71.5 kΩ,1%

47 kΩ,1%

LED1-Green

On

Off

Off

Off

LED2-Red

On

Off

Off

Blink 4

Hz

50 mΩ

9

0.78 V

61. kΩ,1%

47 kΩ,1%

LED1-Green

Off

Blink 1 Hz

On

Blink 4

Hz

LED2-Red

-

-

-

-

50 mΩ

10

0.86 V

51.1 kΩ,1%

47 kΩ,1%

LED1-Green

Off

On

Off

Blink 4

Hz

LED2-Red

-

-

-

-

50 mΩ

11

0.93 V

44.2 kΩ,1%

47 kΩ,1%

LED1-Green

On

Blink 1Hz

On

Off

LED2-Red

On

Off

Off

Blink 4

Hz

50 mΩ

12

1.01 V

36.5 kΩ,1%

47 kΩ,1%

LED1-Green

Off

Off

On

Off

LED2-Red

Off

On

Off

Blink 4

Hz

Input Over Current Protection

Input over current protection protects the transmitter half-bridge and receiver from exposure to conditions that may cause damage or

unexpected behavior from the system. While the P9235A-R is in the power transfer stage, it monitors the input current, through the voltage

across the input current sense resistor. If the input current goes above the programmed threshold, the P9235A-R will shut down for 5 minutes,

and then re-try through digital pings. If the receiver condition remains the same for 5 more minutes, the P9235A-R will continue the periodic

analog pings only (no digital pings). If the receiver is removed, or the input power is cycled, the P9235A-R will restart digital pings immediately.

The ILIM pin voltage selects the input current limit through a voltage divider connected to LDO18. Table 9 shows options for 1, 2, and 3W

systems, given minimum expected efficiencies. The default value input current limit is 1.25A. The default value occurs when ILIM pin is

connected to GND via a 47 kΩ resistor.