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MC34702EK Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc |
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MC34702EK Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 38 page Analog Integrated Circuit Device Data 4 Freescale Semiconductor 34702 PIN CONNECTIONS 20 CS Current Sense Current sense pin of the LDO. Overcurrent protection of the linear regulator external power MOSFET. The voltage drop over the LDO current sense resistor R S is sensed between the CS and LDO pins. The LDO current limit can be adjusted by selecting the proper value of the current sensing resistor R S. 21 LDRV Linear Drive LDO gate drive of the external pass N-channel MOSFET. 22 VIN1 Input Voltage 1 The input supply pin for the integrated circuit. The internal circuits of the IC are supplied through this pin. 23 VDDI Power Supply Internal supply voltage. A ceramic low ESR 1uF 6V X5R or X7R capacitor is recommended. 26 ADDR Address I2C address selection. This pin can either be left open, tied to V DDI, or grounded through a 10 k Ω resistor. 27 EN1 Enable 1 Enable 1 Input. The combination of the logic state of the Enable 1 and Enable 2 inputs determines operation mode and type of power sequencing of the IC. 28 EN2 Enable 2 Enable 2 Input. The combination of the logic state of the Enable 1 and Enable 2 inputs determines operation mode and type of power sequencing of the IC. 29 RT Reset Timer This pin allows programming of the Power-ON Reset delay by means of an external RC network. 30 RST Reset Output (Active LOW) The Reset Control circuit monitors both the switching regulator and the LDO feedback voltages. It is an open drain output and has to be pulled up to some supply voltage (e.g., the output of the LDO) by an external resistor. 31 CLKSEL Clock Selection This pin sets the CLKSYN pin as either an oscillator output or a synchronization input pin. The CLKSEL pin is also used for the I2C address selection. 32 CLKSYN Clock Synchronization Oscillator output/synchronization input pin. Table 1. Pin Function Description (continued) A functional description of each pin can be found in the Functional Pin Description section beginning on page 16. Pin Pin Name Formal Name Definition |
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