BQ20Z80-V102 Datasheet, PDF (3/24 Pages) Texas Instruments – SBS 1.1-COMPLIANT GAS GAUGE ENABLED WITH IMPEDANCE TRACK-TM TECHNOLOGY FOR USE WITH THE bq29312A

bq20z80-V102
www.ti.com
SLUS681A – NOVEMBER 2005 – REVISED MARCH 2006
TERMINAL FUNCTIONS
TERMINAL
NO.
NAME
1
VIN
2
TS1
3
TS2
4
PU
5
PRES
6
SCLK
7
SAFE
8
VDDD
9
RBI
10
SDATA
12
SAFE
13
NC
14
NC
15
SMBC
16
SMBD
17
DISP
18
PFIN
20
LED5
21
LED4
22
LED3
23
LED2
24
LED1
25
XALERT
26
MRST
27
SR2
28
SR1
31
VDDA
32
FILT
33
XCK2/ROSC
34
35
36, 37
11, 19, 38
29, 30
XCK1/VSSA
CLKOUT
NC
VSSD
VSSA
I/O ⁽¹⁾
DESCRIPTION
I
I
I
O
I
I/OD
O
P
P
I/O
O
–
–
I/OD
I/OD
I
I
O
O
O
O
O
I
I
IA
IA
P
IA
O
I
O
-
P
P
Voltage measurement input from the AFE
1^st Thermistor voltage input connection to monitor temperature
2^nd Thermistor voltage input connection to monitor temperature
Output to pull up the PRES pin for system detection
Active low input to sense system insertion and typically requires additional ESD protection
Communication clock to the AFE
Active high output to enforce additional level of safety protection; e.g., fuse blow. (Inverse of pin 12)
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
storage capacitor or a battery input.
Data transfer to and from the AFE
Active low output to enforce additional level of safety protection; e.g., fuse blow. (Inverse of pin 7)
Not used— leave floating
Not used— leave floating
SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq20z80
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-kΩ resistor
and a push-button switch to VSSD.
Active low input to detect secondary protector output status and allows the bq20z80 to report the
status of the 2^nd level protection output
LED5 display segment that drives an external LED depending on the firmware configuration
LED4 display segment that drives an external LED depending on the firmware configuration
LED3 display segment that drives an external LED depending on the firmware configuration
LED2 display segment that drives an external LED depending on the firmware configuration
LED1 display segment that drives an external LED depending on the firmware configuration
Input from bq29312A XALERT output.
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
flow
Connections for a small-value sense resistor to monitor the battery charge- and discharge-current
flow
Positive supply for analog circuitry
Analog input connected to the external PLL filter components which are a 150-pF capacitor to V_SSA,
in parallel with a 61.9-kΩ 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
internal oscillator is used
32.768-kHz crystal oscillator input pin or connected to VSSA if the internal oscillator is used
32.768-kHz output for the bq29312. This pin should be directly connected to the AFE.
Not used— leave floating
Negative supply for digital circuitry
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
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