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LTC2916HTS8-1-TRPBF Datasheet(PDF) 7 Page - Linear Technology |
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LTC2916HTS8-1-TRPBF Datasheet(HTML) 7 Page - Linear Technology |
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7 / 12 page  LTC2915/LTC2916 7 29156fa APPLICATIONS INFORMATION Supply Monitoring The LTC2915/LTC2916 are low voltage single supply monitors with selectable thresholds. Two three-state inputs select one of nine internally programmed thresholds. For the LTC2915, a third three-state input selects the tolerance at which the supply connected to the VM pin is monitored (–5%, –10%, –15%). The tolerance for the LTC2916 is fixed at –5%. Threshold accuracy is guaranteed at ±1.5% over the entire operating temperature range. The LTC2915/LTC2916 asserts the RST output low when VM is below the programmed threshold, and for a reset timeout (tRST)afterVMgoesabovethethreshold.Thereset timeout can be configured to use an internal timer with no external components, or an adjusted timer programmed by placing an external capacitor from RT to ground. Power-Up VCC powers the drive circuits for the RST pin. Therefore, as soon as VCC reaches 0.8V during power up, the RST output asserts low. Until VCC reaches the undervoltage lockout threshold (guaranteed less than 1.5V), RST is held low regardless of the state of VM. Once VCC is above the under voltage lockout threshold and VM is above the programmed threshold, the reset timer is started. After the reset timeout (tRST), the open drain pull-down releases RST and the external pull-up resistor pulls high. Power-Down On power-down, once VM drops below its threshold or VCC drops below the undervoltage lockout, RST asserts logic low. Monitor Threshold Control The monitor threshold on the VM pin is controlled by the SEL1, SEL2 and TOL three-state pins. The SEL1 and SEL2 pins select one of nine preset nominal voltages (including one externally adjustable threshold) as shown in Table 1. The SEL1 and SEL2 three-state input pins should be con- nected to GND, VCC or left unconnected during normal operation. Note that when left unconnected, the maximum leakage allowable from the pin to either GND or VCC is ±5μA. The tolerance at which the monitored supply is measured is set by the TOL pin (LTC2915 only), as shown in Table 2. If desired (e.g. for margining purposes), the TOL pin may be driven by a three-state buffer. That three-state buffer must have a VOL and VOH which meet the VIL and VIH of the TOL pin specified in the Electrical Characteristics, and maintain less than 5μA of leakage in the open state. Threshold Accuracy The trip threshold for VM is selected by configuring the three-state input pins. When using the adjustable input, an external resistive divider sets the trip threshold, allowing the user complete control over the trip point. Selection of this trip voltage is crucial to the reliability of the system. Table 1. Voltage Threshold Settings NOMINAL VOLTAGE SEL1 SEL2 12V VCC VCC 5V VCC Open 3.3V VCC GND 2.5V Open VCC 1.8V Open Open 1.5V* Open GND 1.2V* GND VCC 1V* GND Open ADJ* (0.5V) GND GND *Require a separate supply for VCC Table 2. System Voltage Tolerance Settings TOLERANCE TOL –5% VCC –10% Open –15% GND |
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