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BQ2111LB-XXX

更新时间： 2024-09-15 01:19:51
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7页 744K
描述
NiCd Gas Gauge Module with LEDs for High Discharge Rates

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BQ2111LB-XXX 数据手册

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bq2111L  
NiCd Gas Gauge Module with LEDs  
for High Discharge Rates  
Features  
ä
ä
ä
ä
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Complete bq2011 Gas Gauge solution for NiCd  
packs in high discharge rate applications  
Five surface-mounted LEDs to display  
state-of-charge information  
Battery state-of-charge monitoring for 4- to 12-cell  
series applications  
On-board regulator allows direct connection to the  
battery  
Battery information available over a single-wire  
bidirectional serial port  
ä
ä
Nominal capacity pre-configured  
Compact size for battery pack integration  
A module development kit is also available for the  
bq2111L. The bq2111LB-KT includes one configured  
module and the following:  
General Description  
The bq2111L Gas Gauge Module provides a complete  
and compact solution for capacity monitoring of NiCd  
battery packs in high discharge rate applications such  
as power tools. Designed for battery pack integration,  
the bq2111L incorporates a bq2011 Gas Gauge IC, five  
surface-mounted LEDs, and the other discrete compo-  
nents necessary to monitor and display accurately the  
capacity of 4- to 12-series cells. The only external compo-  
nent required is a low-value sense resistor connected be-  
tween GND and PACK-. Contacts are also provided on  
the bq2111L for direct connection to the battery stack  
and the serial communications port (DQ). The battery  
stack should be connected between BAT+ and GND.  
Please refer to the bq2011 data sheet for the specifics on  
the operation of the Gas Gauge.  
1) An interface board that allows connection to the se-  
rial port of an AT-compatible computer.  
2) Menu-driven software with the bq2111L to display  
charge/discharge activity and to allow user inter-  
face to the bq2011 from any standard DOS PC.  
3) Source code for the TSR.  
Pin Descriptions  
DQ/Serial communication port  
BAT+/Battery positive/Pack positive  
LBAT+/Four--cell power  
PACK-/Pack negative  
P1  
P2  
P3  
P4  
P5  
Unitrode configures the bq2111L based on the informa-  
tion requested in Table 1. The configuration defines the  
number of series cells and the nominal battery pack ca-  
pacity. The bq211L module uses the absolute LED dis-  
play to indicate battery capacity. In this mode, the  
remaining capacity is represented as a percentage of the  
programmed capacity.  
GND/Ground  
The bq2111L can operate directly from four series cells  
within the pack using the LBAT+ supply input. For four  
series cell applications or applications using the on-  
board regulator, LBAT+ should be connected to BAT+.  
Please refer to Figure 1 for module connection illustra-  
tions.  
7/96  
1
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