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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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13892 датащи(PDF) 91 Page - Freescale Semiconductor, Inc |
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13892 датащи(HTML) 91 Page - Freescale Semiconductor, Inc |
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91 / 161 page  Analog Integrated Circuit Device Data Freescale Semiconductor 91 13892 FUNCTIONAL DEVICE OPERATION BATTERY INTERFACE AND CONTROL OVER-VOLTAGE PROTECTION In order to protect the application, the voltage at the CHRGRAW pin is monitored. When crossing the threshold, the charge path regulator will be turned off immediately, by opening M1 and M2, while M3 gets closed. When the over-voltage condition disappears for longer than the debounce time, charging will resume and previously programmed SPI settings will be reloaded. An interrupt CHGFAULTI is generated with associated CHGFAULTM mask bit with the CHGFAULTS[1:0] bits set to 01. In order to ensure immediate protection, the control of M1, M2, and M3 occurs real-time, so asynchronously to the charger state machine. As a result, for over-voltage conditions of up to 30 μs, the charger state machine may not always end up in the over-voltage fault state, and therefore an interrupt may not always be generated. The VBUS pin is also protected against over-voltages. This will occur at much lower levels for CHRGRAW. When a VBUS over-voltage is detected the internal circuitry of the USB block is disconnected. A USBOVI is generated in this case. For more details see Connectivity. When the maximum voltage of the IC is exceeded, damage will occur to the IC and the state of M1 and M2 cannot be guaranteed. If the user wants to protect against these failure conditions, additional protection will be required. Table 64. Charge Path Regulator Characteristics Parameter Condition Min Typ Max Units Input Operating Voltage CHRGRAW BATTMIN - 17 V Output voltage trimming accuracy VCHRG[2:0] = 011 Charge current 50 mA at T = 25 °C - - 0.35 % Output Voltage Spread VCHRG[2 :0] = 011, 1xx - - - Charge current 1.0 to 100 mA -1.5 - 1.5 % Charge current > 100 mA and above -3.0 - 1.5 % Current Limit Tolerance(65) ICHRG[3:0] =0 001 68 80 92 mA ICHRG[3:0] = 0100 360 400 440 mA ICHRG[3:0] = 0110 500 560 620 mA All other settings - - 15 % Start-up Overshoot Unloaded - - 2.0 % Configuration Input Capacitance CHRGRAW (66) - 2.2 - μF Load Capacitor BPSNS (66) 10 - 4.7 μF Cable Length (67) - - 3.0 m Notes 65. Excludes spread and tolerances due to board routing and 100 mOhm sense resistor tolerances. 66. An additional derating of 35% is allowed. 67. This condition applies when using an external charger with a 3.0 m long cable. Table 65. Charger Over-voltage Protection Characteristics Parameter Condition Min Typ Max Units Over-voltage Comparator High Voltage Threshold High to Low, Low to High 16 - 20 V Over-voltage Comparator Debounce Time High to Low - 10 - ms |
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