bq20z80-V101
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SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
Display Timing
When the display is activated, between each active LED illumination there is a delay time of DF:LED Delay.
When all active LEDs are illuminated, the display remains active for DF:LED Hold time. When this time expires,
all LEDs turn off at the same time.
SIZE
(BYTES)
DEFAULT
VALUE
NAME
CLASS / SUBCLASS
FORMAT
VALID RANGE
UNITS
LED Flash Rate
LED Blink Rate
LED Delay
500
1000
100
4
1 to 65535
0 to 255
2
ms
s
LED Hold Time
CHG Thresh 1
CHG Thresh 2
CHG Thresh 3
CHG Thresh 4
CHG Thresh 5
DSG Thresh 1
DSG Thresh 2
DSG Thresh 3
DSG Thresh 4
DSG Thresh 5
CHG Flash Alarm
DSG Flash Alarm
0
20
40
60
80
0
LED Support / LED Cfg (67)
Signed Int
1
0 to 101
%
20
40
60
80
10
10
Display Activation
There are 4 methods of display activation.
1. SBS.ManufacturerAcces( ) commands – See the SBS.ManufacturerAccess( ) section for details.
2. If DF:Operation Cfg A [LEDR] is set, the display is activated on exit from reset.
3. If DF:Operation Cfg A [CHGLED] is set, while SBS.Current( ) is > DF:Chg Current Threshold, the display
remains active.
4. High-to-low logic transition on the DISP pin. The next high-to-low transition of DISP is not recognized until
DF:LED Hold expires.
If DF:Operation Cfg B [PFD0] is set, then the Permanent Failure (PF) display can be activated for a further period
of 2 x DF:LED Hold per each bit set in SBS.PFStatus( ) in two possible ways depending on DF:Operation Cfg B
[PFD1]. The PF display is shown after the normal capacity display.
1. If a high-to-low logic transition on the DISP pin occurs, AND the low-state is held for DF:LED Hold, AND
DF:Operation Cfg B [PFD1] = 0
2. If a high-to-low logic transition on the DISP pin occurs, AND DF:Operation Cfg B [PFD1] = 1.
The display is disabled if either of SBS.SafetyStatus( ) [CUV, PUV] are set.
Application Schematic
69
TI [ TEXAS INSTRUMENTS ]
