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TPS658620ZQZT датащи(PDF) 33 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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3.17 POWER PATH
3.17.1 RAM CONTROL BITS
3.18 SYSTEM STATUS DETECTION
TPS658620
Advanced Power Management Unit
www.ti.com
SLVS993 – OCTOBER 2009
a.
If both write operations are more than 110nsec (typ) apart, the register final value will be set by the
engine that executes the last write operation.
b.
a. If both write operations are less than 110nsec (typ) apart, the priority will be given to the Power
I2C engine. The value from the Power I2C engine will be written into the register, and the data
received by the Standard I2C operation is not written to the TPS658620 internal memory.
THERE IS NO CLOCK STRETCH FUNCTION IN EITHER SCLK OR PSCLK WHEN A CONFLICT
SITUATION HAPPENS. THE CONFLICT IS HANDLED INTERNALLY BY GIVING PRIORITY TO
PSDAT/PSCLK ENGINE.
The power path circuit connects one of the power sources plugged into the AC, USB or BAT pins to the
SYS pin. The supply selection is made based on system parameters monitored by the power path circuit
and internal RAM control bits in register 0x4C.
Table 3-1. Power Path Control
PPATH1 [Addr 0x4C]
Defaults in BOLD
Bit Number
B7
B6
B5
B4
B3
B2
B1
B0
Bit Name
USBSUSP
USBDCH
ACDCH
RSVD4B4
BOOTOFF
USBLIMIT
USBMODE
PWRSYS
USB INPUT
AUTO SYS
USB SUSPEND
CHARGE
USB INPUT ILIMIT
USB INPUT
Function
SPARE
SPARE
CURRENT LIMIT
POWER
MODE
VOLTAGE RANGE
at BOOT PHASE
CURRENT LIMIT
SETTING
SELECTION
SET BY USBLIMIT
When 0
SUSPEND OFF
NOT USED
NOT USED
3.95V-4.2V
100mA
SET BY USBLIMIT
BAT TO SYS
ONLY
SET BY
AUTO MODE
When 1
SUSPEND ON
NOT USED
NOT USED
4.3V-4.45V
USBMODE AND
500mA
2.25 A
ENABLED
USBLIMIT
The input power priority is hard-wired internally, with the AC input having the higher priority, followed by
the USB input (2nd) and the battery pack (3rd). The SYS pin voltage is not regulated and it will be equal
to the input voltage (AC, USB or BAT value) minus the voltage drop across the switch that is ON when the
selected input current limit is not active.
Setting the control bit PWRSYS (bit 0) to 0, the user can override the power path priority, connecting the
battery to the SYS pin even if AC or USB are detected. When PWRSYS is 0 and the battery is removed,
the SYS pin will not be connected back to the AC or USB inputs and thereby will discharge to ground.
The USB power will be ignored when USBSUSP (bit 7) is 1, connecting only the AC or BAT power
sources to the SYS pin. If neither AC nor BAT is connected the SYS pin, it will discharge to ground.
The USB input current is limited to the maximum value programmed by the host via the I2C interface by
setting bits USBLIMIT (bit 2) and USBMODE (bit 1) as shown in Table 3-2.
Table 3-2. Power Path Current Limit
USBMODE
USBLIMIT
USB INPUT CURRENT LIMIT
AC INPUT CURRENT LIMIT
0
0
100 mA max
0
1
500 mA max
2.2 A min
1
X
2.1A min
If the system current requirements exceed the input current limit, the SYS pin voltage will be reduced until
the power path is set in supplement mode (if pack is connected).
The TPS658620 has integrated comparators that monitor the BAT, AC, USB and SYS pin voltages. The
data generated by the comparators is used by the power path control logic to define which of the
integrated power path switches will be active. Table 3-3 lists the system power detection conditions:
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DETAILED DESCRIPTION
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