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SMM150NCR02 数据表(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMM150NCR02 数据表(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 22 page SMM150 Preliminary Information Summit Microelectronics, Inc 2075 2.6 05/13/05 2 GENERAL DESCRIPTION The SMM150 is capable of margining the DC output voltage of LDOs or DC/DC converters that use a trim/adjust pin. The Margin function is programmable over a standard 2-wire I 2C serial data interface and is used to set the margin low/high DC output voltages. In margining mode the user communicates with the SMM150 via the I 2C serial data bus to select the desired values for margining. This allows the part to margin the supplies up or down to these set values either through asserting the MUP and MDN pins or by writing to the margin register directly. The margin high and margin low voltage settings can range from 0.3V to VDD around the converter’s nominal output voltage setting depending on the specified margin range of the DC-DC converter and/or system components, usually ±10%. When the SMM150 receives the command to margin, the TRIM output will begin adjusting the supply to the selected margin voltage. This is accomplished by incrementing (or decrementing) an internal counter based on the digital comparison between the voltage margin target value and that read by the ADC from the VM input. This operation is repeated until the 2 values are equal, after which the SMM150 holds the TRIM output pin at the voltage required to maintain the margin setting. An I 2C command or de-assertion of the MUP/MDN pin will return the TRIM output pin to a high impedance state thus allowing the converter to return to its nominal operating voltage. The SMM150 has two additional input pins and one additional output pin. The input pins, COMP1 and COMP2, are high impedance inputs, each connected to a comparator and compared against the internal reference (VREF, 0.5V or 1.25V). Each comparator can be independently programmed to monitor for UV or OV. When either of the COMP1 or COMP2 inputs are in fault the open-drain FAULT# output will be pulled low. A configuration option exists to disable the FAULT# output during margining. Programming of the SMM150 is performed over the industry standard I 2C 2-wire serial data interface. A status register is available to read the state of the part and a Write Protect (WP) pin is available to prevent writing to the configuration registers and EE memory. |
类似零件编号 - SMM150NCR02 |
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类似说明 - SMM150NCR02 |
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