bq20z80-V101
www.ti.com
SLUS625D–SEPTEMBER 2004–REVISED OCTOBER 2005
These devices have limited built-in ESD protection. The leads should be shorted together or the device
placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
TSSOP (DBT)
(TOP VIEW)
1
2
3
38
37
36
35
34
33
32
31
VIN
VSSD
NC
TS1
TS2
NC
4
PU
PRES
SCLK
SAFE
VDDD
RBI
CLKOUT
XCK1 / VSSA
XCK2 / ROSC
FILT
5
6
7
8
VDDA
VSSA
VSSA
SR1
30
29
28
9
10
11
12
SDATA
VSSD
SAFE
NC
27
26
25
24
23
22
21
20
SR2
13
14
15
MRST
XALERT
LED1
NC
SMBC
16
17
18
19
SMBD
DISP
LED2
LED3
LED4
PFIN
VSSD
LED5
NC - No internal connection
TERMINAL FUNCTIONS
TERMINAL
NAME
I/O(1)
DESCRIPTION
NO.
1
VIN
TS1
I
I
Voltage measurement input from the AFE
2
1st Thermistor voltage input connection to monitor temperature
2nd Thermistor voltage input connection to monitor temperature
Output to pull up the PRES pin for system detection
3
TS2
I
4
PU
O
I
5
PRES
SCLK
SAFE
VDDD
Active low input to sense system insertion and typically requires additional ESD protection
6
I/OD Communication clock to the AFE
7
O
P
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
8
Backup power to the bq20z80 data registers during periods of low operating voltage. RBI accepts a
storage capacitor or a battery input.
9
RBI
P
10
12
13
14
15
16
SDATA
SAFE
NC
I/O
O
–
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
NC
–
SMBC
SMBD
I/OD SMBus clock open-drain bidirectional pin used to clock the data transfer to and from the bq20z80
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-kΩ resistor
and a push-button switch to VSSD.
17
18
DISP
PFIN
I
Active low input to detect secondary protector output status and allows the bq20z80 to report the
I
status of the 2nd level protection output
20
21
LED5
LED4
O
O
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
(1) I = Input, IA = Analog input, I/O = Input/output, I/OD = Input/Open-drain output, O = Output, OA = Analog output, P = Power
2
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