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BQ78412 Fiches technique(PDF) 4 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) 4 Page - Texas Instruments

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bq78412
SLUSAA0 – OCTOBER 2010
www.ti.com
PIN DESCRIPTIONS
bq78412
I/O/P
DESCRIPTION
NAME
No.
A0
21
I
Configuration input. Connect to ground.
A1
22
I
Configuration input. Connect to ground.
AVDD
14
P
3.3-V power to the analog logic. Typically connected to REG33.
15
AVSS
P
Connect to ground.
29
BUZZER
10
O
Buzzer output. Active high when alarm condition is detected.
Active high output, turns on display enable transistor. Not required in all applications. Blanks display during
DISPEN
32
O
updates.
DVDD
39
P
3.3-V supply to the digital logic. Connect a 2.2- µF capacitor to VSS. Typically connected to REG33.
DVSS
41
P
Connect to ground
REG33
28
P
Regulated 3.3-V power output.
RST_N
44
I
Connect to external RC network for power-up reset.
31
RSVD
Reserved, no connection required.
40
RS–
17
I
Current sense negative
RS+
18
I
Current sense positive
RXD
9
I
UART RX data
6
O
I2C clock output
SCL
24
I
I2C clock for internal use. Connect to SCL pin 6.
SCLK
2
O
Low-to-high transition clocks data into external serial in, parallel out shift register.
SD
7
O
IR XCVR Shutdown; HIGH=XCVR in shutdown, LOW=XCVR Active
5
I/O
I2C data
SDA
23
I/O
I2C data for internal use. Connect to SDA pin 5.
SDAT
3
O
Serial display data to serial in, parallel out shift register. A low bit turns on an LED.
TEST1
34
I/O
Test pin, no connection
TEST2
35
I/O
Test pin, no connection
TEST3
36
I/O
Test pin, no connection
TEST4
37
I/O
Test pin, no connection
TEST5
38
I/O
Test pin, no connection
TXD
8
O
UART TX data
VBAT+
25
P
Input to internal regulator.
VS
16
I
Sense voltage. Connect to battery positive.
Input terminal of 8-MHz crystal oscillator or crystal pin. (Optional: Can be left unconnected to use internal
XIN
43
I
oscillator)
Output terminal of 8-MHz crystal oscillator or crystal pin. (Optional: Can be left unconnected to use internal
XOUT
42
O
oscillator)
1
4
11
12
13
N/C
No connection
19
20
26
27
33
4
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Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): bq78412


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