BQ2085 Datasheet, PDF (3/56 Pages) Texas Instruments – SBS-COMPLIANT GAS GAUGE IC FOR USE WITH THE bq29311

bq2085
SLUS541 – OCTOBER 2002
Terminal Functions
TERMINAL
NAME
No.
CLKOUT
35
DISP
17
FILT
32
EVENT
18
LED1
24
LED2
23
LED3
22
LED4
21
LED5
20
MRST
26
N/C
4, 5, 7, 13,
14, 25, 36, 37
OC
3
RBI
9
ROSC
SAFE
SCLK
SDATA
SMBC
SMBD
SR1
SR2
TS
VDDA
VDDD
VIN
VSSA
VSSD
VSSP
33
12
6
10
15
16
28
27
2
31
8
1
30, 34
11, 19, 38
29
I/O
DESCRIPTION
I 32.768-kHz output to the bq29311
I Display control for the LED drivers LED1 through LED5
I Analog input connected to the external PLL filter
I Input from bq29311 XALERT output
O
O
O LED display segments that each may drive an external LED
O
O
I Master reset input that forces the device into reset when held high
– No connection
I Analog input for auto ADC offset compensation; should be connected to VSSA
I
Register backup that provides backup potential to the bq2085 data registers during periods of low
operating voltage. RBI accepts a storage capacitor or a battery input.
I Internal time base bias input
O Output for additional level of safety protection; e.g., fuse blow.
O Communication clock to the bq29311
I/O Data transfer to and from bq29311
I/O SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq2085
I/O SMBus data open-drain bidirectional pin used to transfer address and data to and from the bq2085
I
Connections for a small-value sense resistor to monitor the battery charge- and discharge-current flow
I
I Thermistor voltage input connection to monitor temperature
I Positive supply for analog circuitry
I Positive supply for digital circuitry and I/O pins
I Single cell voltage input from the bq29311
I Negative supply for analog circuitry
I Negative supply for digital circuitry
I Negative supply for output circuitry
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