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BQ20Z80-V102 Datasheet(PDF) 3 Page - Texas Instruments

Part No. BQ20Z80-V102
Description  SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK TM TECHNOLOGY FOR USE WITH THE BQ29312A
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ20Z80-V102 Datasheet(HTML) 3 Page - Texas Instruments

 
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bq20z80-V102
SLUS681B – NOVEMBER 2005 – REVISED JANUARY 2007
TERMINAL FUNCTIONS
TERMINAL
I/O(1)
DESCRIPTION
NO.
NAME
1
VIN
I
Voltage measurement input from the AFE
2
TS1
I
1st Thermistor voltage input connection to monitor temperature
3
TS2
I
2nd Thermistor voltage input connection to monitor temperature
4
PU
O
Output to pull up the PRES pin for system detection
5
PRES
I
Active low input to sense system insertion and typically requires additional ESD protection
6
SCLK
I/OD
Communication clock to the AFE
7
SAFE
O
Active high output to enforce additional level of safety protection; e.g., fuse blow. (Inverse of pin 12)
8
VDDD
P
Positive supply for digital circuitry and I/O pins
Backup power to the bq20z80 data registers during periods of low operating voltage. RBI accepts a
9
RBI
P
storage capacitor or a battery input.
10
SDATA
I/O
Data transfer to and from the AFE
12
SAFE
O
Active low output to enforce additional level of safety protection; e.g., fuse blow. (Inverse of pin 7)
13
NC
Not used— leave floating
14
NC
Not used— leave floating
15
SMBC
I/OD
SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq20z80
16
SMBD
I/OD
SMBus data open-drain bidirectional pin used to transfer address and data to and from the bq20z80
Display control for the LEDs. This pin is typically connected to bq29312A REG via a 100-k
Ω resistor
17
DISP
I
and a push-button switch to VSSD.
Active low input to detect secondary protector output status and allows the bq20z80 to report the
18
PFIN
I
status of the 2nd level protection output
20
LED5
O
LED5 display segment that drives an external LED depending on the firmware configuration
21
LED4
O
LED4 display segment that drives an external LED depending on the firmware configuration
22
LED3
O
LED3 display segment that drives an external LED depending on the firmware configuration
23
LED2
O
LED2 display segment that drives an external LED depending on the firmware configuration
24
LED1
O
LED1 display segment that drives an external LED depending on the firmware configuration
25
XALERT
I
Input from bq29312A XALERT output.
26
MRST
I
Master reset input that forces the device into reset when held high
Connections for a small-value sense resistor to monitor the battery charge- and discharge-current
27
SR2
IA
flow
Connections for a small-value sense resistor to monitor the battery charge- and discharge-current
28
SR1
IA
flow
31
VDDA
P
Positive supply for analog circuitry
Analog input connected to the external PLL filter components which are a 150-pF capacitor to VSSA,
32
FILT
IA
in parallel with a 61.9-k
Ω resistor and a 2200-pF capacitor in series. Place these components as
close as possible to the bq20z80 to ensure optimal performance.
32.768-kHz crystal oscillator output pin or connected to a 100k, 50ppm or better resistor if the
33
XCK2/ROSC
O
internal oscillator is used
34
XCK1/VSSA
I
32.768-kHz crystal oscillator input pin or connected to VSSA if the internal oscillator is used
35
CLKOUT
O
32.768-kHz output for the bq29312. This pin should be directly connected to the AFE.
36, 37
NC
-
Not used— leave floating
11, 19, 38
VSSD
P
Negative supply for digital circuitry
29, 30
VSSA
P
Negative supply for analog circuitry.
(1)
I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power
3
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