BQ2050_15 Datasheet, PDF (15/27 Pages) Texas Instruments – Lithium Ion Power Gauge™ IC

Not Recommended For New Designs
bq2050
not affect the NAC register. The temperature adjust-
ments are detailed in the CACH and CACL register de-
scriptions.
When DISP is tied to VCC, the SEG1–5 outputs are inac-
tive. When DISP is left floating, the display becomes ac-
tive whenever the bq2050 detects a charge in progress
VSRO > VSRQ . When pulled low, the segment outputs be-
come active for a period of four seconds, ± 0.5 seconds.
The segment outputs are modulated as two banks, with
segments 1, 3, and 5 alternating with segments 2 and 4.
The segment outputs are modulated at approximately
100Hz with each segment bank active for 30% of the pe-
riod.
SEG1 blinks at a 4Hz rate whenever VSB has been de-
tected to be below VEDV1 (EDV1 = 1), indicating a low-
battery condition. VSB below VEDVF (EDVF = 1) disables
the display output.
Microregulator
The bq2050 can operate directly from one cell. A micro-
power source for the bq2050 can be inexpensively built
using the FET and an external resistor to accommodate
a greater number of cells; see Figure 1.
15