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ADM13307-33ARZ-RL7 Datenblatt(PDF) 10 Page - Analog Devices |
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ADM13307-33ARZ-RL7 Datenblatt(HTML) 10 Page - Analog Devices |
10 / 12 page ADM13307 Rev. 0 | Page 10 of 12 THEORY OF OPERATION The ADM13307 devices are triple voltage supervisors designed to monitor up to three supplies and provide a reset signal to DSP and microprocessor-based systems. There are five models available, all of which feature a combina- tion of internally pretrimmed undervoltage threshold options for monitoring 1.8 V, 2.5 V, 3.3 V, and 5 V supplies. There are also adjustable input options with threshold voltages of either 0.6 V or 1.25 V. ADM13307-18, ADM13307-25, and ADM13307-33 models have two internally fixed thresholds and one externally programmable threshold, via a resistor string, while the ADM13307-4 and ADM13307-5 offer one internally fixed threshold and two externally programmable thresholds via a resistor string. See the Ordering Guide for a list of all available options. INPUT CONFIGURATION The ADM13307 is powered through VDD. To increase noise immunity in noisy applications, place a 0.1 μF capacitor between the VDD input and ground. The SENSEv inputs are resistant to short power supply glitches. Do not allow unused SENSEv inputs to float or to be grounded, instead connect it to a supply voltage greater than its specified threshold voltage. Typically, the threshold voltage at an adjustable SENSEv input is either 0.6 V or 1.25 V. Refer to the Ordering Guide for details. For example, to monitor a voltage greater than 1.25 V, con- nect a resistor divider network to the device as depicted in Figure 13, where, ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = R2 R2 R1 V MONITERED V 25 . 1 R1 R2 MONITORED VOLTAGE VREF = 1.25V Figure 13. Setting the Adjustable Monitor RESET OUTPUT The reset outputs are guaranteed to be in the correct state for VDD down to 1.1 V. During power up, RESET is asserted when the supply voltage becomes greater than 1.1 V. Once the supplies monitored at the SENSEv pins rise above their associated threshold level, the RESET signal remains low for the reset timeout period before deasserting. Subsequently, if a supply monitored by the SENSEv pins falls below its associated thresh- old, the RESET output reasserts. SENSEv V(NOM) 0 1 VIT– RESET td td t t Figure 14. Reset Timing Diagram The ADM13307 features both an active-low push-pull RESET output and active-high push-pull RESET output. MANUAL RESET (MR) The ADM13307 features a manual reset input, which when driven low, asserts the reset output, as shown in Figure 15. When MR transitions from low to high, the reset remains asserted for the duration of the reset active timeout period before deasserting. An external push-button switch can be connected between MR and ground to allow the user to generate a reset. 0 1 RESET td t 0 1 t MR Figure 15. Manual Reset Timing Diagram |
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Ähnliche Beschreibung - ADM13307-33ARZ-RL7 |
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