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SMS64FR06 Datasheet(PDF) 10 Page - Summit Microelectronics, Inc. |
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SMS64FR06 Datasheet(HTML) 10 Page - Summit Microelectronics, Inc. |
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10 / 24 page  SMS64 Preliminary Summit Microelectronics, Inc 2060 2.22 10/09/03 10 VOLTAGE MONITOR Figure 3 shows a block diagram of a voltage monitor. The curved resistive element is a symbolic representation of a non-volatile DAC. When using the SMX3200 (dongle) and GUI software the threshold level that is selected is programmed into the SMS64, effectively adjusting the output of the DAC to the requested threshold detection level. The internal detection circuit resolution is 8-bits and the threshold detection range is 0.9V to 6.0V. This allows adjusting the programmable threshold voltage (VPTH) in 20mV increments. In applications where the voltage to be monitored is outside the standard range, or is even a negative voltage, the ‘naked input’ option can be selected. This will effectively disconnect the DAC from ground making the VCC and VM high impedance inputs to the DAC. With this option selected the input is directly compared to the internal reference voltage of 0.5V. This will require the use of an external resistor divider circuit. If this option is selected, the user must insure that the external resistors will not allow the VCC or VM inputs to exceed the recommended operating ranges. The comparator has two mux’ed voltage inputs, VCC and VM. The VCC inputs are used as ‘precondition qualifiers’ (No fault conditions exist) before the SMS64 is ready to begin any power-on sequence. Once the sequence has commenced the mux will automatically switch the comparator to the VM input. {When using the GUI for the SMS64 this option is on the channel settings tab and located in the block designated ‘triggers’} The VCC inputs are also used as the supply input for the SMS64. Internally all of the VCC inputs are diode-OR’ed and the highest VCC input will effectively become the SMS64 VDD supply. If the VCC input is not selected as a precursor to power-on, it can be tied to the corresponding VM input, left open or be tied to one of the other VCC inputs The output of the comparator is programmable to generate either an over-voltage or under-voltage signal. PUP OUTPUTS The primary function of the PUP outputs is to turn- on or switch external power sources; for example, turning on low drop-out regulators or DC-to-DC converters or by providing a high-side drive output to a MOSFET (Figure 4) Each PUP output can be programmed as active high or active low. If active low, the SMS64 will pull the PUP output to GND in its active state. An external pull-up resistor must be tied to the PUP output. If active high is selected, an inactive PUP output will be pulled low. Asserting the PUP output will release the open drain output, necessitating an external pull-up resistor. When the PUP outputs are configured as active high or active low they must not be pulled-up to a potential higher than VDD_CAP. The PUP output can also be configured as a high- side driver that can be used to turn on the gate of an external MOSFET. The gate voltage for all PUP outputs can be programmed to either 10.5V or 14.5V. APPLICATIONS INFORMATION PUP X Delay 'up' Delay 'dn' Input Select UV/OV C UV/OV A UV/OV B UV/OV F UV/OV D UV/OV E Highside Driver Active High Active Low Figure 4. PUP Configuration Diagram - + V REF VCC VM NV-DAC 'naked' input select UV/OV Input Select Figure 3. Voltage Monitor Diagram |
Similar Part No. - SMS64FR06 |
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Similar Description - SMS64FR06 |
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