MPC18730EPSLASHR2 datasheet(18/38 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

18730

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

When RSTO1B(int) is Low, output LVB voltage to V_STBY

terminal. When RSTO1B(int) is High, output VO1 voltage to

V_STBY terminal. When CLR is Low, LSWO is open. When

RSTO1B(int) is High and CLR is High, LSWO output voltage

turns GND. When RSTO1B(int) is Low and RSTO1B is High,

discharge the external capacitor which is connected to

V_STBY. When using Ni_mh, short-circuit VB and LVB to

external components and HVB to GND. When using Li_ion,

short-circuit HVB to VB, and leave LVB open. When using

Ni_MH, the VB voltage is output from V_STBY in Standby

mode. When using Li-Ion, 50% of the VB voltage is output to

V_STBY terminal in Standby Mode.

RESET CIRCUIT

Figure 8. Reset Circuit Block Diagram

When the VO1 or VO2 voltage is higher than the reference

value, RSTO1B or 2B goes High. When RSTO1B(int) is Low

and RSTO1B is High, SLEEP(int) is forced to place the chip

into the standby mode.

Connect a capacitor between RST1ADJ and CRST. The

capacitor is not necessary if a resistor of 330KΩ or less is

inserted between RST1ADJ and VC1 for reset adjustment

Connect the capacitor between RST1ADJ and RSTB as

directed below.

When SEQSEL is Low: Between RST1ADJ and CRST1

When SEQSEL is High: Between RST1ADJ and CRST2

Use a capacitor with approximately half of the

capacitance between CRST and GND

Table 8. HVB and LVB Connection

MODE

HVB

LVB

Li_ion

VB(28)

open

Ni_mh

GND

VB(28)

Notes

28.

Externally connect to VB.

Table 9. V_STBY and LSWO Operation

INPUT

OUTPUT

WAKE(Int)

RSTO1B(Int)

CLR

V_STBY

LSWO

VO1

Z : High Impedance, X : Don’t care

BANDGAP

REFERENCE

(RSTO1B side only)

RST1B, 2B

Reset

Control

CRST1, 2

RST1ADJ

RSTO1B, 2B(Int)

CRST1, 2

VO1

VO1, 2 VG

MPC18730EP/R2 Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc

MPC18730EP/R2 Datasheet(HTML) 18 Page - Freescale Semiconductor, Inc

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