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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS658620ZQZT датащи(PDF) 33 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 33 Page - Texas Instruments |
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33 / 104 page  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: Submit Documentation Feedback DETAILED DESCRIPTION 33 |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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