MCP16502 datasheet(22/86 Pages) MICROCHIP

22 / 86 page

MCP16502

DS20006275D-page 22

 2019-2022 Microchip Technology Inc. and its subsidiaries

FIGURE 4-2:

Finite State Machine (FSM) States Diagram for MCP16502AC.

4.3.5

SELVL1 AND SELV2 PINS

SELVL1 and SELV2 pins are meant to program the

default settings of some rails that must be activated

during the power-up sequence, but whose voltage

values are application-dependent. These are LDO1 and

Buck2, the latter being dedicated to DDRx/LPDDRx

power.

The default values are selectable among three options,

corresponding to three different states of the relevant

pin: connected to ground (Low), connected to input

supply (High) or left unconnected (High-Z).

The LDO1 default voltage can be selected by means of

the SELVL1 pin as follows:

The Buck2 default voltage can be selected by means of

the SELV2 pin as follows:

TABLE 4-4:

VOUT2 DEFAULT VOLTAGE

VS. SELV2 PIN

The statuses of SELVL1 and SELV2 are frozen in a snap-

shot as soon as the SVIN voltage exceeds the turn-on

Undervoltage Lockout Threshold (UVLO) as specified in

the “Electrical Characteristics” table. Any changes of

the SELVL1 and SELV2 pins will have no effect after the

snapshot, and SVIN must fall under the turn-off (lower)

UVLO threshold to unfreeze the snapshot.

OFF

All Bucks are Off

VIN > UVLO

Start Event

(nSTRT Pulled Low)

Start-up

Sequence

- nRSTO =

Active

All Bucks in FPWM

- nRSTO =

PWRHLD =

and LPM =

PWRHLD =

and LPM =

Low-Power

All Bucks in Auto-PFM

- nRSTO =

PWRHLD =

and LPM =

PWRHLD =

and LPM =

PWRHLD =

and LPM =

HIBERNATE

Buck2,4 in Auto-PFM

Buck1, Buck3 Off

- nRSTO =

PWRHLD =

and LPM =

PWRHLD =

and LPM =

PWRHLD

Low-to-High

Transition

LPM = Don’t Care

PWRHLD =

and LPM =

PWRHLD =

and LPM =

High-Performance

Active

- Buck Regulators

Programmed by I

Settings

- nRSTO =

PWRHLD =

and HPM =

and LPM =

PWRHLD =

and HPM =

LPM =

PWRHLD =

and LPM =

PWRHLD

Low-to-High

Transition

- HPM Pin Logic State Detection Requires

Unmasking I

2C Command (HPMPEN =

- HPM =

x (internally seen as ‘0’) Before

Unmasking

PWRHLD =

and LPM =

HPM = Don’t Care

PWRHLD =

and LPM =

HPM = Don’t Care

PWRHLD =

and LPM =

PWRHLD =

and LPM =

PWRHLD =

and HPM =

and LPM=

Blue Dashed Paths

Indicate Power State

Transitions which are

Possible for the

MCP16502, but not Used

in Typical MPU Applications

TABLE 4-3:

VLOUT1 VOLTAGE VS. SELVL1

SELVL1 Status

VLOUT1 Voltage

Low

1.8V

High-Z

2.5V

High

3.3V

SELV2 Status

VOUT2 Voltage

DDR Type

Low

1.2V

LPDDR2,

LPDDR3

High-Z

1.35V

DDR3L

High

1.8V

DDR2

Note:

SELVL1 and SELV2 are always hardwired

in the final application and they cannot be

changed on-the-fly during operation.

MCP16502 Datasheet(PDF) 22 Page - Microchip Technology

MCP16502 Datasheet(HTML) 22 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

Datasheet Download

Link URL