BQ500414Q Datasheet, PDF (12/34 Pages) Texas Instruments – Qi Compliant Wireless Power Transmitter Manager

bq500414Q
SLUSBE4B – JANUARY 2014 – REVISED JUNE 2014
www.ti.com
Feature Description (continued)
8.3.7 LED Modes
The bq500414Q can directly drive three LED outputs (pin 7, pin 8, and pin 9) through a simple current limit
resistor (typically 470-Ω), based on the mode selected. The three current limit resistors can be individually
adjusted to tune or match the brightness of the LEDs. Do not exceed the maximum output current rating of the
device.
The selection resistor, connected between pin 44 and GND, selects one of the desired LED indication schemes
presented in Table 1.
Table 1. LED Modes
LED
CONTROL
OPTION
LED
SELECTION
RESISTOR
DESCRIPTION
X
< 36.5 kΩ Reserved, do not use
1
42.2 kΩ
Choice number 1
2
48.7 kΩ
Choice number 2
3 ⁽³⁾
56.2 kΩ
Choice number 3
4
64.9 kΩ
Choice number 4
5
75 kΩ
Choice number 5
6
86.6 kΩ
Choice number 6
7
100 kΩ
Choice number 7
LED
LED1, green
LED2, red
LED3, amber
LED1, green
LED2, red
LED3, amber
LED1, green
LED2, red
LED3, amber
LED1, green
LED2, red
LED3, amber
LED1, green
LED2, red
LED3, amber
LED1, green
LED2, red
LED3, amber
LED1, green
LED2, red
LED3, amber
LED1, green
LED2, red
LED3, amber
STANDBY
-
Off
Off
-
On
On
-
Off
-
-
Off
Off
-
Off
Off
Off
Off
Off
Off
Off
Off
Off
OPERATIONAL STATES
POWER
TRANSFER
CHARGE
COMPLETE
FAULT
FOD Warning
-
-
-
-
Blink slow⁽¹⁾
Off
-
Blink slow⁽¹⁾
Off
-
On
-
-
On
Off
-
Off
On
Off
Blink slow⁽¹⁾
Off
Off
Blink slow⁽¹⁾
Off
Off
On
Off
Off
Off
On
Blink fast⁽²⁾
-
-
-
On
Off
Off
Off
On
Blink fast⁽²⁾
-
-
-
Off
Blink fast⁽²⁾
On
-
-
-
-
-
-
Off
Off
Off
Off
On
Blink fast⁽²⁾
-
-
-
On
Off
Off
Off
Off
On
Off
Blink slow⁽¹⁾
Off
On
Off
Off
Off
On
Blink fast⁽²⁾
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
On
Blink fast⁽²⁾
(1) Blink slow = 0.625 Hz
(2) Blink fast = 2.5 Hz
(3) The indication of the shutdown after an Negative Temperature Coefficient (NTC) event may experience a delay in the rapid LED blinking
even though the power transfer has been disabled. The indication delay may persist up to as long as the entire NTC FAULT holdoff
time.
12
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