MPC18730EPSLASHR2 datasheet(17/38 Pages) FREESCALE

17 / 38 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

18730

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

START-UP CONTROL INPUT (SYSTEM CONTROL)

The latch is set at the rising edge of any WAKE1B-4B input

pin, and WAKE(int) goes High. WAKE1~4B inputs consist of

OR logic. At this time, the input pin which went Low keeps

latched until CLR goes High. After the latch is reset by CLR,

WAKE(int) goes Low when SLEEP goes High. The latch is

also cleared and WAKE(int) goes Low when SLEEP goes

High before the latch is cleared by CLR. In this case, CLR

keeps negated while RSTO1B, 2B(Ext) is Low. SLEEP keeps

negated while RSTO1B, 2B(Ext) is Low or CLR is High. The

period of time for which CLR and SLEEP are negated can be

set by the SEQSEL pin. Refer to Truth Table 5, on page 13

for the correspondence between the SEQSEL pin settings

and negation period.

If SLEEP goes High to place the chip into the standby

mode while any of the WAKEB pins is Low, the chip can be

awakened again. This may happen if, when an WAKEB pin

and LSWO are connected, SLEEP goes High earlier than the

period of time (*1) specified by the external component of the

WAKEB pin.

Also, if the period of time after WAKE(int) goes High until

CLR goes High from Low is longer than the time specified by

WDT, internal sleep will start up to place the chip into the

standby mode.

(*1: It is 30 µsec when a capacitor is not connected as the

external component.)

Figure 6. Start-Up Timing Diagram

STANDBY POWER SUPPLY CIRCUIT

Figure 7. Standby Power Supply Circuit Diagram

CLR

WDT

WAKEB

WAKE(Int)

Time specified by WDT

CLR

LVB

Short-circuit VB and LVB, and connect a Schottky

diode between VB and V_STBY only when using

Ni_mh.

When using Li_ion, leave LVB open, and short-

circuit HVB and VB.

RST1B

RST1B(Int)

VO1

LSWO

V_STBY

HVB

Standby

Power

Supply

Control

MPC18730EP/R2 数据表(PDF) 17 Page - Freescale Semiconductor, Inc

MPC18730EP/R2 数据表(HTML) 17 Page - Freescale Semiconductor, 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

数据表下载