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AD5100 Datasheet(PDF) 12 Page - Analog Devices |
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AD5100 Datasheet(HTML) 12 Page - Analog Devices |
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12 / 36 page  AD5100 Rev. 0 | Page 12 of 36 THEORY OF OPERATION The AD5100 is a programmable system management IC that has four channels of monitoring inputs. Three inputs have high voltage (30 V) capability. For example, if the AD5100 is used in an automotive application, V1MON (Monitoring Input 1) can be connected to the battery and the V2MON can be connected to the ignition switch, a rising edge trigger wake-up signal, or the media-oriented systems transport (MOST) wake-up signal (V4MON is connected to V2MON for MOST applications). Two other inputs, V3MON and V4MON, are designed for low voltage monitoring, with programmable thresholds from 2.93 V to 7.96 V. The two high voltage monitoring inputs control the shutdown signal, SHDN and reset signal, RESET, while the two low voltage monitoring inputs control the reset signal, RESET. SHDN and RESET are both disabling signals for external devices. The differences between these two outputs are in output level and driving capabilities, as described in the section. The WDI (watchdog) and Outputs MR (manual reset) inputs also control the RESET output, for use with an external digital processor. shows the general flow chart and summarizes the AD5100 functions and features. Figure 5 Table 10 YES NO SHDN = 0* SHDN = 0 RESET = 0 RESET = 0 RESET = 0 RESET = 0 RESET = 0 YES NO SHDN = 0* V1MON > UV V1MON < OV YES YES NO SHDN = 0 NO SHDN = 0 SHDN = 1 V2MON > ON V2MON > OFF (V2MON RISING EDGE SENSITIVE SELECTED) V2MON LEVEL SENSITIVE SELECTED YES NO CONTINUE MONITORING NO YES V4MON > THRESHOLD V4OUT = 0 V4OUT = 1 NO YES USING V4OUT FOR PWM NO YES V4MON > THRESHOLD NO YES V3MON > THRESHOLD YES NO VALID WDI YES NO VALID WDI NO YES FLOATING WDI DISABLED YES STANDARD WDI SELECTED YES NO MR = 1 RESET = 0 YES NO FLOATING WDI NO (ADVANCE WDI SELECTED) * SEE TABLE 11 RESET CONFIGURATION REGISTER: IF [0] = 0, THEN SHDN = 0 AND RESET = 0 IF [0] = 1, THEN SHDN = 0 AND RESET = 1 DEFAULT PATHS Figure 5. General Flow Chart Table 10. AD5100 Functions and Features Input Monitoring Range Shutdown Control Reset Control Fault Detection Functions and Features If Not Used V1MON 6 V to 28.29 V Yes Yes Yes Overvoltage/undervoltage thresholds Does not apply V2MON 3 V to 24.75 V Yes Yes Yes On/off voltage thresholds; pseudo rising edge triggered, wake-up selectable; MOST wake-up signal (V2MON connected to V4MON) Connect to V1MON, minimum input 6 V V3MON 2.32 V to 4.97 V No Yes Yes Connect to VOTP and set threshold to minimum V4MON 1.67 V to 7.96 V No Yes Yes Additional output Connect to GND WDI 0 V to 5 V Yes Yes No Standard, advance, or floating; watchdog selectable Leave floating MR 0 V to 5 V Yes Yes No Highest priority on RESET over other inputs Leave floating |
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