MEC1632 datasheet(123/636 Pages) MICROCHIP

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 2012-2018 Microchip Technology Inc.

DS00001592B-page 123

MEC1632

7.5.2

POWER SUPPLY CONFIGURATIONS

There are two acceptable types of MEC1632 power supply configuration that fundamentally differ based on the need

for a backup battery connection to VBAT. In both cases VTR is connected to the suspend supply as described in Sec-

tion 7.5.1, "Power Supplies and Clocks ACPI Context," on page 121.

7.5.2.1

TYPE 1

TYPE 1 configurations do not use a VBAT backup battery connection, VBAT is tied to VTR and the Reset Interface gen-

erates a VBAT_POR whenever VTR powers up as described in Section 7.6.5, "VBAT_POR," on page 128.In TYPE

1 configurations the VBAT-Powered Control Interface is fully operational when VTR is powered.

7.5.2.2

TYPE 2

TYPE 2 configurations use a VBAT backup battery connection. Power supply requirements for TYPE 2 configurations

are as follows: VBAT is connected to a backup battery that is externally switched through a diode with VTR (Figure 7-

17).

In this configuration some internal components that utilize the VBAT power plane are switched internally to VTR using

a Power Mux when VTR power is applied as described in Section 7.7.1, "Power Mux," on page 129.

In TYPE 2 configurations, the VBAT-Powered Control Interface can be used to power-on an unpowered system.

FIGURE 7-17:

TYPE 2 POWER SUPPLY CONFIGURATION

VTR

VBAT

VTR

VBAT

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