SLEEP Mode
57
SLUUBD3D – September 2015 – Revised September 2018
Copyright © 2015–2018, Texas Instruments Incorporated
Power Modes
8.3.2 ManufacturerAccess() MAC Sleep
The Sleep MAC command can override the requirement for bus low to enter SLEEP. In this case, the
clock and data high condition are ignored for SLEEP to exit, though SLEEP will also exit if there is any
further SMBus communication. The device can be sent to SLEEP with
ManufacturerAccess()
if specific
sleep entry conditions are met.
8.3.3 IN SYSTEM SLEEP Mode
The bq78350-R1 provides an option to enter SLEEP mode when the battery is in the system. When the
DA Configuration [IN_SYSTEM_SLEEP]
= 1, the device will enter SLEEP mode when
OperationStatus()[PRES]
= 1 and all other sleep conditions are also met.
In the IN SYSTEM SLEEP mode, it is possible to read the data if
[IN_SYSTEM_SLEEP]
= 1 and Bus
Timeout = 0. This setting allows the gauge to enter SLEEP mode with active communication in progress.
8.4
SHUTDOWN Mode
8.4.1 Voltage Based Shutdown
To minimize power consumption and avoid draining the battery, the device can be configured to shutdown
at a programmable voltage threshold. In SHUTDOWN mode, the device turns off the FETs after
FET Off
Time
, and then shuts down to minimize power consumption after Delay time. Both
FET Off Time
and
Delay
time are referenced to the time the gauge receives the command. Thus, the
Delay
time must be set
longer than the
FET Off Time
. When the device is in PERMANENT FAILURE mode, the parameters
PF
Shutdown Voltage
and
PF Shutdown Time
configure the voltage-based shutdown.
Status
Condition
Action
Enable
Min(Cell Voltage in
DAStatus1()
) <
Shutdown
Voltage
OperationStatus()[SDV]
= 1
Trip
Min(Cell Voltage in
CellVoltage1..15()
)
continuous <
Shutdown Voltage
for
Shutdown Time
Turn DSG FET off for
Shutdown Time
Shutdown
Protection Configuration:VAUXR
= 0
Send device into SHUTDOWN mode
Shutdown
Protection Configuration:VAUXR
= 1 AND
VAUXVoltage()
<
Charger Present
Threshold
Send device into SHUTDOWN mode
Exit
Voltage at TS1 pin > V
BOOT
OperationStatus()[SDV]
= 0
Return to NORMAL mode
NOTE:
The device goes through a full reset when exiting from SHUTDOWN mode, which means the
device will re-initialize. The RAM data is re-loaded with a data flash setting. This is different
than a partial reset, which could occur during a short power glitch. The device will check for
the RAM integrity at partial reset, and if the data checksum is correct, RAM data will not be
re-initialized.
The configuration options for SHUTDOWN are in the following data flash.
Class
Subclass
Name
Type
Min
Max
Default
Unit
Power
Shutdown
Shutdown Voltage
I2
0
32767
1750
mV
Power
Shutdown
PF Shutdown Voltage
I2
0
32767
1750
mV
Power
Shutdown
Shutdown Time
U2
0
255
10
s
Power
Shutdown
PF Shutdown Time
U2
0
255
10
s
Power
Shutdown
Charger Present
Threshold
I2
0
32767
3000
mV
Power
Ship
FET Off Time
U1
0
127
20
s
Power
Ship
Delay
U1
0
254
20
s
Power
Ship
Auto Ship Time
U2
0
65535
1440
min
