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LT8722 Datasheet(PDF) 19 Page - Analog Devices |
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LT8722 Datasheet(HTML) 19 Page - Analog Devices |
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19 / 30 page  LT8722 19 For more information www.analog.com Rev. 0 Table 11. AOUT Voltage vs AMUX[3:0] when AMUX_TEST = 0 AMUX[3:0] VOLTAGE 0000 VILIMP 0001 VILIMN 0010 V1P25 – 0.8 • VDAC 0011 V1P25 – (VLDR – VSFB)/16 0100 V1P65 – IOUT/10 0101 0.6 • V2P5 0110 V1P25 0111 V1P65 1000 VTEMP 1001 0.9 • V2P5 – VIN/8 1010 0.4 • VCC 1011 0.4 • VDDIO 1100–1111 (16/17) • V1P25 + VSFB/17 Table 12. AOUT Voltage vs AMUX[3:0] when AMUX_TEST = 1 AMUX[3:0] VOLTAGE 0000–0100, 1001, 1100–1111 See Table 12 0101 (6/13) • V2P5 0110 0.8 • V1P25 + 0.2 • VCC 0111 (2/3) • V1P65 1000 0.855 • VTEMP 1010 (3/7) • VCC 1011 (4/7) • VDDIO DRIVING THE SWEN PIN The SWEN pin is an input/output pin. When SWEN and SWEN_REQ are high, SWEN_INT is asserted, and the SW pin begins to switch. SWEN is pulled low internally by the LT8722 when the LT8722 detects a fault. This pin can also be pulled low by an external circuit to disable switch- ing and put SW into a high impedance mode. The SWEN pin can be driven in an open-drain fashion as shown in Figure 9. The SWEN pin can be driven in a CMOS fashion as shown in Figure 10. Figure 11 shows the SWEN pin coupled to 3.3V through a 20k pull-up resistor. In this case SWEN will go high when the SPIS_STATUS[10:4] bits are cleared and FAULT goes low. 200k 20k FAULT 1.25V SWEN_REQ SWEN_INT 3.3V PULL-UP RESISTOR OPEN-DRAIN NMOS DEVICE 8722 F09 LT8722 EXTERNAL CIRCUITRY SWEN + – Figure 9. Open-Drain Drive of the SWEN Pin 200k 20k FAULT 1.25V SWEN_REQ SWEN_INT 3.3V OPTIONAL LOGIC TO SENSE SWEN PIN STATUS 8722 F10 LT8722 EXTERNAL CIRCUITRY SWEN + – Figure 10. CMOS Drive of the SWEN Pin 200k 20k SWEN FAULT 1.25V SWEN_REQ SWEN_INT 3.3V LT8722 EXTERNAL CIRCUITRY PULL-UP RESISTOR 8722 F11 + – Figure 11. Simple Resistor Pull-Up on the SWEN Pin OPERATION |
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