MPC18730EPR2 datasheet(15/35 Pages) FREESCALE

15 / 35 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

18730

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

DUTY CONTROL PINS (DMAX1, DMAX2)

Connected external voltage to this pin via capacitance can

control the duty of DC/DC converter switching. Use of the pin

for this is not recommended.

REFERENCE FEEDBACK PINS (EAOUT1, EAOUT2)

Output node of internal error amp. for DC/DC converter 1

and 2. Used for phase compensation.

INPUT MINUS PINS (EAIN1, EAIN2)

Minus input of internal error amp. for DC/DC converter 1

and 2. Used for phase compensation.

CHARGE PUMP CAPACITOR PIN (CH_PUMP)

In case of use higher voltage than VGATE externally,

connect capacitance and diodes between VGATE. The

charge pump structure can output VGATE + VB - 2 x VF

voltage. There is no meaning for Ni-MH or dry cell battery,

because the VB voltage is almost same as 2 x VF voltage.

Recommend to use for Li-Ion battery use.

GATE VOLTAGE PIN (VGATE)

Output pin of boost converter for gate drive voltage. The

output voltage is decided by VGSEL input.

SWITCHING FOR GATE VOLTAGE PIN (SWGATE)

Switching pin for VGATE boost converter. Connect to

external inductance.

BATTERY VOLTAGE PIN (VBATT)

Power supply input that connects to Ni-MH or Dry cell or

Li-Ion battery.

VGATE SELECT PINS (VGATESEL1, VGATESEL2)

VGATE output voltage is decided with these two bits input.

VOLTAGE INPUT FOR POWER SWITCH 2 PIN

(VO2_SENSE_IN)

Input of VOUT2 output via power switch. Connect to

VO2_SENSE pin externally.

STEP DOWN FET GATE DRIVE PINS (HG, LG)

Gate drive output pins for external FETs to use DC/DC

converter 2 as Buck / Boost converter.

GATE SWITCH PIN (VGATE_EXT)

Gate drive output pin for external low side switch. It can be

used for power switch turning On/OFF for remote controller

part.

REGULATOR CONTROL PINS (SREGC1, SREGC2,

SREGC3)

Feed back pin for each series regulators. This pin voltage

is compared with internal reference voltage. Input the feed

back voltage that divided SREGO voltage by resistances.

REGULATOR OUTPUT PINS (SREGO1, SREGO2,

SREGO3)

Series regulator output pins. All output voltages can be

variable with internal DAC via serial I/F.

REGULATOR INPUT PINS (SREGI1, SREGI2,

SREGI3)

Series regulator power input pins. To be connected to

battery voltage in general.

GROUND PIN (GND)

Ground pin for logic and analog circuit portion (not power

portion). Recommend to connect to clean ground which

separated with power ground line.

REFERENCE VOLTAGE PIN (VREF)

Output of internal reference voltage. It can be used

externally. Output current capacity is less than 300

µA.

DATA INPUT PIN (DATA)

Serial data input pin for the serial interface. The last 12 bits

received before the strobe signal’s low to high transition are

latched.

STROBE PIN (STRB)

Strobe signal input pin for serial interface. It latches the 12

bits of data input to the internal control registers.

SERIAL CLOCK PIN (SCKIN)

Clock input pin for serial interface. Input data are taken in

to I/F with this clock.

WATCH DOG TIMER PIN (WATCHDOG)

Watch dog timer prevent unstable wake up (flips between

wake-up and failure). If there is no ‘CLEAR’ input after any

WAKEnB input before this WATCHDOG is expired, this

device moves to ‘SLEEP’ mode to prevent wake failure

hanging-up situation.

SEQUENCE SELECT PIN (SEQ_SELECT)

Select judgement Reset channel for wake-up complete

with this input. If this input level is V_STDBY voltage, this

device judges the wake-up completion with Reset2 (DC/

DC2). If it is Ground, judge with Reset1 (DC/DC1). See

Table 7, on page 13.

MPC18730EPR2 датащи(PDF) 15 Page - Freescale Semiconductor, Inc

MPC18730EPR2 датащи(HTML) 15 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

датащи скачать

ссылки URL