BQ2007 datasheet(7/16 Pages) TI

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Display Driver Modes

The bq2007 is designed to interface with LCD or LED

type displays. The LED signal levels are driven when

the MSEL soft-programmed input is pulled to VCC at ini-

tialization. The output pin COM is the common anode

connection for LED SEGA–G.

The LCD interface mode is enabled when the MSEL

soft-programmed input pin is pulled to VSS at initializa-

tion. An internal oscillator generates all the timing sig-

nals required for the LCD interface. The output pin

COM is the common connection for static direct-driving

of the LCD display backplane and is driven with an AC

signal at the frame period. When enabled, each of the

SEGA–G pins is driven with the correct-phase AC signal

to activate the LCD segment. In bargraph or BCD mode,

output pins SEGA–G interface to LED or LCD segments.

Battery Voltage and Temperature

Measurement

The battery voltage and temperature are monitored

within set minimum and maximum limits. When MULT is

pulled up to VCC, battery voltage is sensed at the BAT pin

by a resistive voltage divider that divides the terminal

voltage between 0.262

∗ VCC (VEDV) and 0.8 ∗ VCC (VMCV).

The bq2007 charges multi-cell battery packs from a mini-

mum of N cells, to a maximum of 1.5

∗ N cells. The battery

voltage divider is set to the minimum cell battery pack (N)

by the BAT pin voltage divider ratio equation:

R21 33

=−

(

)

When MULT is pulled down to VSS, tighter charge

voltage limits and voltage-based charge status display

are selected. This is recommended for charging packs

with a fixed number of cells where the battery voltage

divider range is between 0.4

∗ VCC (VEDV) and 0.8 ∗ VCC

bq2007

Mode

Display Indication

SEGA

SEGB

SEGC

SEGD

SEGE

SEGF

SEGG

QDSEL = H

20% charge

1000000

30% charge

1100000

40% charge

1110000

60% charge

1111000

80% charge

1111100

90% charge

1111110

Charge complete

1111111

QDSEL = L

0% charge—digit 0

1111110

10% charge—digit 1

0110000

20% charge—digit 2

1101101

30% charge—digit 3

1111001

40% charge—digit 4

0110011

50% charge—digit 5

1011011

60% charge—digit 6

1011111

70% charge—digit 7

1110010

80% charge—digit 8

1111111

90% charge—digit 9

1111011

Charge complete—letter F

1000111

Fault condition—letter E

1001111

Discharge—letter d

0111101

Note:

1 = on; 0 = off; L = pulled down to VSS; H = pulled up to VCC.

Table 3. bq2007 Charge Status Display Summary

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