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BQ2014SN-D120TR Datasheet

  • BQ2014SN-D120TR

  • Gas Gauge IC with External Charge Control

  • 233.59KB

  • 22页

  • TI

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bq2014
Reset Register (RST)
The reset register (address=39h) provides the means to
perform a software-controlled reset of the device. By
writing the RST register contents from 00h to 80h, a
bq2014 reset is performed.
Setting any bit other than
the most-significant bit of the RST register is
not al-
lowed,
and results in improper operation of the bq2014.
Resetting the bq2014 sets the following:
n
n
n
When DISP is tied to V
CC
, the SEG
1鈥?
outputs are inac-
tive.
Note: DISP must be tied to V
CC
if the LEDs
are not used.
When DISP is left floating, the display
becomes active whenever the NAC registers are count-
ing at a rate equivalent to V
SRO
< -4mV or charge cur-
rent is detected, V
SRO
> V
SRQ
. When pulled low, the seg-
ment outputs become active immediately. A capacitor
tied to DISP allows the display to remain active for a
short period of time after activation by a push-button
switch.
The segment outputs are modulated as two banks of
three, with segments 1, 3, and 5 alternating with seg-
ments 2 and 4. The segment outputs are modulated at
approximately 100Hz, with each segment bank active
for 30% of the period.
SEG
1
blinks at a 4Hz rate whenever V
SB
has been de-
tected to be below V
EDV1
(EDV1 = 1), indicating a low-
battery condition. V
SB
below V
EDVF
(EDVF = 1) disables
the display output.
LMD = PFC
CPI, VDQ, NAC, and NACL = 0
CI and BRP = 1
Note:
Self-discharge is disabled when PROG
5
= H.
Display
The bq2014 can directly display capacity information us-
ing low-power LEDs. If LEDs are used, the program
pins should be resistively tied to V
CC
or V
SS
for a pro-
gram high or program low, respectively..
The bq2014 displays the battery charge state in relative
mode. In relative mode, the battery charge is repre-
sented as a percentage of the LMD. Each LED segment
represents 20% of the LMD.
The capacity display is also adjusted for the present bat-
tery temperature. The temperature adjustment reflects
the available capacity at a given temperature but does
not affect the NAC register. The temperature adjust-
ments are detailed in the TMPGG register description.
Microregulator
The bq2014 can operate directly from 3 or 4 cells. To facili-
tate the power supply requirements of the bq2014, an REF
output is provided to regulate an external low-threshold n-
FET. A micropower source for the bq2014 can be inexpen-
sively built using the FET and an external resistor; see
Figure 1.
15

BQ2014SN-D120TR 产品属性

  • 2,500

  • 集成电路 (IC)

  • PMIC - 电池管理

  • -

  • 燃料，电量检测计/监控器

  • 镍镉（NiCd）、镍金属氢化物（NiMH）

  • 3 V ~ 6.5 V

  • 0°C ~ 70°C

  • 表面贴装

  • 16-SOIC（0.154"，3.90mm 宽）

  • 16-SOIC N

  • 带卷 (TR)

  • 296-9509-ND - EVAL MOD BQ20XX GAS GAUGE IC'S

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