ACT8937A datasheet(28/45 Pages) ACTIVE-SEMI

28 / 45 page

ACT8937A

Rev 1, 22-Oct-12

Innovative Power

ActivePMU

TM and ActivePathTM are trademarks of Active-Semi.

2CTM is a trademark of NXP.

- 28 -

www.active-semi.com

Table 5:

Control Pins

PIN NAME

OUTPUT

nPBIN

REG1, REG2, REG3, REG4, REG5, REG6, REG7

PWRHLD

REG1, REG5

PWREN

REG2, REG3, REG4, REG6, REG7

Control Signals

Enable Inputs

The ACT8937A features a variety of control inputs,

which are used to enable and disable outputs

depending upon the desired mode of operation.

PWRHLD is a logic input, and nPBIN is a unique,

multi-function input. Refer to Table 5 for a

description of which channels are controlled by

each input.

nPBIN Multi-Function Input

ACT8937A features the nPBIN multi-function pin,

which combines system enable/disable control with

warm and cold manual reset functions. Select either

of the two pin functions by asserting this pin, either

through a direct connection to GA, or through a

50kΩ resistor to GA, as shown in Figure 2.

Warm/Cold Manual Reset Function

The second major function of the nPBIN input is to

provide warm and cold manual reset function. To

manually reset the processor, drive nPBIN directly

to GA through a low impedance (less than 2.5kΩ).

An internal timer detects the duration of the manual

reset event.

Short Press/Warm Reset

When the manual reset button is pressed for less

than 130ms, ACT8937A commences a warm reset

operation where nRSTO immediately asserts low,

then remains asserted low until the manual reset

button is released for 130ms.

Long Press / Cold Reset (Power Cycle)

When the manual reset button is pressed for more

than 130ms, ACT8937A commences a power cycle

routine in which case all regulators are turned off

and then turned back on after reset button is

released with all the registers reloaded to default

values. When the ACT8937A turns on again, it

stays enabled for 260ms, the PWRHLD need to be

asserted during this time so that the system

remains

powered,

otherwise

the

ACT8937A

automatically shuts down.

Figure 2:

nPBIN Input

ACT8937A

DIRECTION

SAMSUNG S5V210

PWREN

XPWRRGTON

SCL

Xi2cSCL[0]

SDA

Xi2cSDA[0]

VSEL

DVS_GPIO

nRSTO

XnRESET

nIRQ

XEINT0

nPBSTAT

XEINT1

nLBO

XnBATF

PWRHLD

Power hold GPIO

Table 4:

ACT8937A and Samsung S5PV210 Signal Interface

: Optional connection for DVS control.

: Typical connections shown, actual connections may vary.

: Optional connection for power hold control.

ACT8937A Datasheet(PDF) 28 Page - Active-Semi, Inc

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