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SMM150ECR04 数据表(PDF) 10 Page - Summit Microelectronics, Inc. |
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SMM150ECR04 数据表(HTML) 10 Page - Summit Microelectronics, Inc. |
10 / 22 page SMM150 Preliminary Information Summit Microelectronics, Inc 2075 2.6 05/13/05 10 When measuring the delay time external to the device, ADC sample time and Update Trim time ( ≅ 4ms) must be added to the internally programmed delay time as shown: Spec Actual measurement 2.5 ms 6.5 ms 5 ms 9 ms 10 ms 14 ms 17.5 ms 22 ms MONITOR The SMM150 monitors the COMP1 and COMP2 pins. COMP1 and COMP2 are high impedance inputs, each connected internally to a comparator and compared against the programmable internal reference voltage. Each comparator can be independently programmed to monitor for either UV or OV. The monitor level is set externally with a resistive voltage divider. The COMP pins can be connected to Vin, Vout or any voltage that needs to be monitored. The internal comparators COMP1/2 are compared to VREF, so the voltage dividers are set above or below the programmed VREF level depending on whether monitoring UV or OV. As an example, with VREF set to 1.25V, to monitor an OV of 1.7V on COMP1 and a UV of 1.3V on COMP2, the voltage divider resistors are: For OV, RUpper = 1.37k, 1% RLower = 3.83k, 1%. For UV, RUpper = 1.02k, 1% RLower = 25.5k, 1%. The part can be programmed to trigger the FAULT# pin when either COMPx comparator has exceeded the UV or OV range. The READY and FAULT# outputs of the SMM150 are active as long as the triggering limit remains in a fault condition. The READY pin is programmable active high/low open drain output indicates that VM is at its’ set point. When programmed as an active high output, READY can also be used as an input. When pulled low, it will latch the state of the comparator inputs. 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 while the device is in margining mode. STATUS REGISTER A status register exists for I 2C polling of the status of the COMP1 and COMP2 inputs. Two bits in this status register reflect the current state of the inputs (1 = fault, 0 = no fault). Two additional bits show the state of the inputs latched by one of two events programmed in the configuration. The first event option is the FAULT# output going active. The second event option is the READY pin going low. The READY pin is an I/O. As an output, the READY output pin goes active when the DC controlled voltages are at their set point. As an input programmed to active high, it can be pulled low externally and latch the state of the COMP inputs. This second event option allows the state of the COMP inputs on multiple devices to be latched at the same time while a host monitors their FAULT# outputs. MARGINING The SMM150 has two additional control voltage settings: margin high and margin low. The margin high and margin low settings can be as much as ±10% of the nominal setting depending on the manufacturer. The margin high and margin low voltage settings can range from 0.3V to VDD around the converters’ nominal output voltage setting depending on the specified margin range of the DC-DC converter. These settings are stored in the configuration registers and are loaded into the control voltage setting by margin commands issued via the I 2C bus. The margin command registers contain two bits that decode the commands to margin high or margin low. Once the SMM150 receives the command to margin the supply voltage, it begins adjusting the supply voltage to move toward the desired setting. When this voltage setting is reached, a bit is set in the margin status registers and the READY signal becomes active. Note: Configuration writes or reads of registers 00HEX to 03HEX should not be performed while the SMM150 is margining. FAULTS 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 while the device is margining. If “Fault Output Disabled while Margining” is selected, Faults are disabled for all margining except when margining to the ‘Off’ and ‘Nominal’ states. Also, the programmable feature ‘Fault Holds Off and Shutdown Control’ is enabled only for the Nominal margin state. APPLICATIONS INFORMATION (CONTINUED) |
类似零件编号 - SMM150ECR04 |
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类似说明 - SMM150ECR04 |
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