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BQ78412 Fiches technique(PDF) 12 Page - Texas Instruments

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No de pièce BQ78412
Description  Pb-Acid Battery State-of-Charge Indicator With Run-Time Display
Download  36 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

BQ78412 Fiches technique(HTML) 12 Page - Texas Instruments

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background image
1
2
8
9
3
4
5
6
Q0
Q1
Q2
Q3
A
B
CLK
CLR
SN74HC164
14
7
VCC
GND
10
11
12
Q4
Q5
Q6
13
Q7
GRN
GRN
GRN
GRN
YEL
YEL
YEL
RED
LED9
LED8
LED7
LED6
LED5
LED4
LED3
LED2
SDAT
SCLK
VCC
VBAT
DISPEN
1
2
8
9
3
4
5
6
Q0
Q1
Q2
Q3
A
B
CLK
CLR
SN74HC164
14
7
VCC
GND
10
11
12
Q4
Q5
Q6
13
Q7
RED
RED
RED
YEL
GRN
GRN
GRN
GRN
LED1
LED0
Replace
Warn
Good
Charge
Discharge
Full
MMBT
3904
MMBT
3904
UDG-10083
bq78412
SLUSAA0 – OCTOBER 2010
www.ti.com
Figure 2 shows the application schematic showing the 10-bar LED bar graph display and status LED
connections.
Figure 2. 10-Bar LED Bar Graph Display and Status LED Connections
Buzzer Operation
A buzzer can be set to beep on various conditions. Bits in the DevConfig2 register control the number of beeps
sounded on each condition. Each beep is sounded for 1 second and gaps (that is, silence period) between beeps
(if set for multiple beeps) are also of 1 second duration. Setting the number of beeps to 0 for a condition is
equivalent to disabling the buzzer operation for that condition.
One hour after an overvoltage or undervoltage condition is detected (and the buzzer sounds) the device checks
for this condition again. The buzzer again sounds (the same number of beeps) if the condition persists. From
then on, this condition is not checked for until the battery voltage returns to the normal range.
12
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Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): bq78412


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