BQ27421-G1 Datasheet, PDF (6/20 Pages) Texas Instruments – System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor

bq27421-G1
SLUSB85 – MAY 2013
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LDO REGULATOR, WAKE-UP AND AUTO-SHUTDOWN AC CHARACTERISTICS
T_A = –40°C to 85°C, typical values at T_A = 30°C and V_REGIN = 3.6 V (unless otherwise noted)(Force Note1)⁽¹⁾
PARAMETER
TEST CONDITIONS
MIN
TYP
t_SHDN ⁽¹⁾
SHUTDOWN Entry Time
Time delay from SHUTDOWN
command to LDO output disable.
t_SHUP ⁽¹⁾
SHUTDOWN GPOUT Low time Minimum low time of GPOUT (input)
10
in SHUTDOWN before WAKEUP
t_VDD ⁽¹⁾
Initial V_DD Output delay
13
t_WUVDD ⁽¹⁾
Wake-up V_DD Output delay
Time delay from rising edge of
8
GPOUT (input) to nominal VDD
output.
t_PUCD
Power-up communication delay Time delay from rising edge of
250
REGIN to the Active state. Includes
firmware initialization time.
MAX
250
(1) Specified by design. Not production tested.
UNIT
ms
μs
ms
ms
ms
SHUTDOWN and WAKE-UP Timing
t_VDD
REGIN
VDD
I2C Bus
GPOUT ^*
State Off
t_PUCD
WAKE-UP
t_SHDN
t_SHUP
t_WUVDD
t_PUCD
SHUTDOWN_
ENABLE
SHUTDOWN
Active
SHUTDOWN
WAKE-UP
Active
* GPOUT is configured as an input for wake-up signaling.
Figure 1. SHUTDOWN and WAKE-UP Timing Diagram
6
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