Datasheet
LED_MODE
44
Resistors
to set
options
bq500411 A
To 12-bit ADC
43
LOSS_THR
bq500211A
SLUSBB1A – DECEMBER 2012–REVISED SEPTEMBER 2013
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.
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.
Table 1. LED Modes
Operational States
LED LED
DYNAMIC
CONTROL SELECTION DESCRIPTION LED
POWER CHARGE
STANDBY FAULT POWER
OPTION RESISTOR
TRANSFER COMPLETE
LIMITING™
LED1, green
X < 36.5 kΩ Reserved, do not use - - - - -
LED2, red
LED1, green Off Blink slow On Off Blink slow
1 42.2 kΩ Choice number 1
LED2, red Off Off Off On Blink slow
LED1, green On Blink slow On Off Blink slow
2 48.7 kΩ Choice number 2
LED2, red On Off Off On Blink slow
LED1, green Off Off On Off Off
3 56.2 kΩ Choice number 3
LED2, red Off On Off Blink slow On
LED1, green Off On Off Off Off
4 64.9 kΩ Choice number 4
LED2, red Off Off Off On Blink slow
> 75 kΩ Reserved, all LED off - - - - - -
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