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PAC5255 Datasheet(PDF) 15 Page - Active-Semi, Inc |
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PAC5255 Datasheet(HTML) 15 Page - Active-Semi, Inc |
15 / 74 page PAC5255 Power Application Controller 9. PIN DESCRIPTION Table 4. Multi-Mode Power Manager and System Pin Description PIN NAME PIN NUMBER TYPE DESCRIPTION CSM 20 Analog Switching supply current sense input. Connect to the positive side of the current sense resistor. DRM 23 Analog Switching supply driver output. Connect to the base or gate of the external power NPN or n-channel MOSFET. See PAC User Guide and application notes. EP (VSS) EP Power Exposed pad. Must be connected to VSS in a star ground configuration. Connect to a large PCB copper area for power dissipation heat sinking. REGO 19 Power System regulator output. Connect to VSYS directly or through an external power-dissipating resistor. VCC18 2 Power Internally generated 1.8V core power supply. Connect a 2.2μF or higher value ceramic capacitor from VCC18 to VSSA. See Figure 9-1. Power Supply Bypass Capacitor Routing below. VCC33 5 Power Internally generated 3.3V power supply. Connect a 2.2μF or higher value ceramic capacitor from VCC33 to VSSA. See PCB layout note below. VCCIO 56 Power Internally generated digital I/O power supply. Connect a 4.7μF or higher value ceramic capacitor from VCCIO to VSSA. See Figure 9-1. Power Supply Bypass Capacitor Routing below. VHM 22 Power Switching supply controller supply input. Connect a 1μF or higher value ceramic capacitor, or a 0.1μF ceramic capacitor in parallel with a 10μF or higher electrolytic capacitor from VHM to VSSP. This pin requires good capacitive bypassing to VSSP, so the ceramic capacitor must be connected with a shorter than 10mm trace from the pin. See Figure 9-1. Power Supply Bypass Capacitor Routing below. VP 21 Power Main power supply. Provides power to the power drivers as well as voltage feedback path for the switching supply. Connect a properly sized supply bypass capacitor in parallel with a 0.1μF ceramic capacitor from VP pin to VSS for voltage loop stabilization. This pin requires good capacitive bypassing to VSS, so the ceramic capacitor must be connected with a shorter than 10mm trace from the pin. See See Figure 9-1. Power Supply Bypass Capacitor Routing below. VSS 7 Power Ground. VSSA 6 Power Analog ground. Connect to VSS in a star ground configuration. VSSP 24 Power Power ground. Connect to VSS in a star ground configuration. VSYS 18 Power 5V system power supply. Connect a 4.7μF or higher value ceramic capacitor from VSYS to VSSP. See Figure 9-1. Power Supply Bypass Capacitor Routing below. XIN 57 Analog Crystal oscillator driver input. Leave floating if unused. XOUT 1 Analog Crystal oscillator driver output. Leave floating if unused. - 15 - Rev 1.10‒March 3, 2018 |
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