ACT5880 datasheet(60/87 Pages) ACTIVE-SEMI

60 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 60 -

www.active-semi.com

ActivePMU

TM and ActivePathTM are trademarks of Active-Semi.

I2CTM is a trademark of NXP.

Active-Semi Confidential―Do Not Copy or Distribute

The ACT5880 is a combinations of many circuit

blocks including step-down DC/DCs, a step-up

DC/DC, LDOs, an RTC, an ADC block with a front

end for both TSC and general purpose analogue

signal acquisition. Each of those blocks has its own

control and configuration register, shares the same

interface block, same house keeping block which

provides common resource to other blocks,

including operation supervising, interrupts, clock

reference and voltage references. Those blocks

make a two layers architecture in system point of

view.

System and Control Information

Figure 1 shows the top level functional block

diagram of the ACT5880. The ACT5880 manages 3

different power inputs and 4 groups of functional

macro-blocks. The ACT5880 can be enabled, when

system control interface and most power regulators

are available for using, only when either the adaptor

power or the main battery is available, or both of

them are available; When there is only the backup

power available, only the always-on regulator keeps

the VALIVE output and RTC running.

Figure 1:

The Top Level Block Diagram of The ACT5880

The backup battery charger, the always-on

regulator and the RTC circuit are not subject to the

enable status of the ACT5880. Whenever there is

any of adaptor power and/or main battery power are

available, the backup battery charger charges or

floating charges the backup battery or the storage

cap, the always-on regulator outputs to the RTC

staff.

Device Power States

The ACT5880 has 2 powered states, which are

enable state and disable state. The ACT5880 could

be turned into enable state only when either or both

the adaptor power and the main battery are

available.

In the enable state, the ACT5880 power rails may

or may not output, dependent on how those

regulators are programmed. There are 5 events or

signals that pull the ACT5880 into the enable state,

which are the nPBIN assertion, the valid adaptor

input voltage, the HFPWR assertion, the PWRHLD

assertion and the RTC alarm wake-up event. The

ACT5880 turns into disable state only when all

those 5 events or signals are de-asserted.

System Control Signals

There are 7 foreign signals and 2 internal signals

for the system control in the ACT5880. Table 1 lists

those signals.

Table 1:

The System Control Signals to The ACT5880

All manipulation and configuration registers are

accessible through the "fast mode" (up to 400kHz)

I2C compatible interface with standard I2C session

frame for read/write to one of single byte addressed

registers. The ACT5880 is a slave device with

device address of [1011010] or 86. In each

read/write session, the device address is sent firstly

with the 8th bit indicating that the session is for read

(1) or for write (0), followed by a register address

byte and the bidirectional transferred data byte,

each aligns MSB first and is followed by an

acknowledge bit.

Among those 9 signals, the ON6, the ON9, the SDA

and SLC of the I2C interface work only when the

ACT5880 is enabled.

APPLICATION INFORMATION

SIGNALS

DESCRIPTIONS

PBIN

Push-Button input assertion.

HFPWR

Hand-free power requested.

PWRHLD

Input for request to hold the power output.

ON6

Dedicated on/off control for OUT6.

ON9

Dedicated on/off control for OUT9.

SDA

SCL

(ACOK)

Internal signal, is true when the CHGIN

input voltage is valid.

(ALARM)

Internal signal, is true when the RTC alarm

happens if the RTC wake-up is set.

I2C compatible serial interface.

ACT5880 датащи(PDF) 60 Page - Active-Semi, Inc

ACT5880 датащи(HTML) 60 Page - Active-Semi, Inc

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 87

датащи скачать

ссылки URL