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ISL9228IRZ Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL9228IRZ Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 11 page 7 FN6687.0 February 13, 2009 Functional Pin Description CRDL (Pin 1) Cradle input. This pin is usually connected to a cradle power input. The maximum input voltage is 28V. The charge current from this pin is programmable with the ICDL pin up to 1A. When this pin is connected to a power source, no charge current is drawn from the USB pin. A 1µF or larger value ceramic capacitor is recommended for decoupling. USB (Pin 2) USB input. This pin is usually connected to a USB port power connector. Other sources that are also acceptable. The charge current from the USB pin is fixed at typically 380mA. A 1µF or larger value ceramic capacitor is recommended for decoupling. It is also recommended to have a 1 Ω resistor in series with the decoupling capacitor to prevent an over-shoot voltage when a USB cable is plugged in. PPR (Pin 3) Power presence indication. An open-drain output pin which turns ON when either the USB input voltage or the CRDL input voltage is within the power good range (refer to the Description section for definition of power good condition), regardless if the charger is enabled or disabled. Otherwise turns OFF. This pin provides a wake-up signal to a microprocessor when either the cradle or the USB power is connected. CHG (Pin 4) Charge indication pin. An open-drain output which turns ON when the charge current is above programmable threshold. Otherwise turns OFF. EN (Pin 5) Enable logic input. Connect to LOW or leave floating to enable the charger. IMIN (Pin 6) IMIN is the programmable input for the end-of-charge current. IMIN is calculated by Equation 1: Where RIMIN is in kΩ. IMIN is applicable for both cradle and USB charging. VF (Pin 7) VF is an input pin for the battery ID resistor connection. This pin has an internal 1000k Ω pull-up resistor. Thus a typical 20k Ω ID resistor will pull this pin to logic low state, indicating a valid battery connection. If the battery is removed, the VF pin will be pulled to a logic high state by the internal resistor, the charger will be disabled as a result, regardless of the status of the EN pin. The maximum ID resistor is 100k Ω. GND (Pin 8) System ground. ICDL (Pin 9) The ICDL pin has two functions. The first function is to program the cradle charge current during the constant- current mode. The voltage of this pin is 1.22V during the constant-current mode of the cradle charger. The constant- current mode current is programmed by Equation 2: FIGURE 9. CRADLE INPUT QUIESCENT CURRENT vs INPUT VOLTAGE FIGURE 10. USB INPUT QUIESCENT CURRENT vs INPUT VOLTAGE Typical Operating Performance The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25°C, RICDL = 12.4kΩ, RIMIN = 10.0kΩ, VBAT = 3.7V unless Otherwise Noted. (Continued) 0 100 200 300 400 500 600 700 800 0 5 10 15 20 25 TEMPERATURE (°C) DISABLED ENABLED IOUT = 0mA DISABLED ENABLED IOUT = 0mA 0 100 200 300 400 500 600 700 800 0 5 10 15 20 25 TEMPERATURE (°C) DISABLED ENABLED IOUT = 0mA DISABLED ENABLED IOUT = 0mA I MIN 550 R IMIN ---------------- mA () = (EQ. 1) I CDL 6820 R ICDL ----------------- mA () = (EQ. 2) ISL9228 |
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