BQ500211A Datasheet, PDF (12/27 Pages) Texas Instruments – 5-V, WPC1.1 Compliant Wireless Power Transmitter Manager

bq500211A
SLUSBB1 – DECEMBER 2012
www.ti.com
Option Select Pin
Two pins (pin 43 and pin 44) on the bq500211A are allocated to program the Loss Threshold and the LED mode
of the device. At power up, a bias current is applied to pins LED_MODE and LOSS_THR and the resulting
voltage measured in order to identify the value of the attached programming resistor. The values of the operating
parameters set by these pins are determined using Table 2. For LED_MODE, the selected bin determines the
LED behavior based on Table 1; for the LOSS_THR, the selected bin sets a threshold used for parasitic metal
object detection (see Parasitic Metal Detection (PMOD) and Foreign Object Detection (FOD) section). Table 1.
bq500411 A
Resistors
to set
options
LED_MODE ₄₄
LOSS_THR ₄₃
To 12-bit ADC
Figure 5. Option Select Pin Programming
LED Indication Modes
The bq500211A can directly drive two LED outputs (pin 7 and pin 8) through a simple current limit resistor
(typically 470 Ω), based on the mode selected. The two current limit resistors can be individually adjusted to tune
or match the brightness of the two LEDs. Do not exceed the maximum output current rating of the device.
The resistor in Figure 5 connected to pin 44 and GND selects the desired LED indication scheme in Table 1.
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
56.2 kΩ
Choice number 3
4
64.9 kΩ
Choice number 4
> 75 kΩ
Reserved, all LED off
Table 1. LED Modes
LED
STANDBY
Operational States
POWER
TRANSFER
CHARGE
COMPLETE
FAULT
LED1, green
-
LED2, red
LED1, green
Off
LED2, red
Off
LED1, green
On
LED2, red
On
LED1, green
Off
LED2, red
Off
LED1, green
Off
LED2, red
Off
-
-
-
Blink slow
Off
Blink slow
Off
Off
On
On
Off
-
-
-
On
Off
Off
On
On
Off
Off
On
On
Off
Off
Blink slow
Off
Off
Off
On
-
-
DYNAMIC
POWER
LIMITING™
-
Blink slow
Blink slow
Blink slow
Blink slow
Off
On
Off
Blink slow
-
12
Submit Documentation Feedback
Product Folder Links: bq500211A
Copyright © 2012, Texas Instruments Incorporated