71M6545HT-IGTRSLASHF datasheet(12/66 Pages) MAXIM

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71M6545T/71M6545HT

Energy Meter ICs

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Electrical Characteristics (continued)

Recommended External Components

Note 1: Parameter not tested in production, guaranteed by design to six-sigma.

Note 2: If the capacitor values of CXS = 15pF and CXL = 10pF have already been installed, then changing the CXL value to 33pF

and leaving CXS = 15pF would minimize rework.

(Limits are production tested at TA = +25ºC. Limits over the operating temperature range and relevant supply voltage range are guar-

anteed by design and characterization.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SPI

Data-to-Clock Setup Time

Data Hold Time From Clock

Output Delay, Clock to Data

CS-to-Clock Setup Time

Hold Time, CS to Clock

Clock High Period

Clock Low Period

Clock Frequency (as a Multiple

of CPU Frequency)

2.0

MHz/MHz

Space Between SPI

Transactions

4.5

CPU

Cycles

EEPROM INTERFACE

I2C SCL Frequency

MPU clock = 4.9MHz, using interrupts

310

kHz

MPU clock = 4.9MHz, bit-banging DIO2-DIO3

100

3-Wire Write Clock Frequency

MPU clock = 4.9MHz, PLL_FAST = 0

160

kHz

MPU clock = 4.9MHz, PLL_FAST = 1

490

RESET

Reset Pulse Width

(Note 1)

µs

Reset Pulse Fall Time

(Note 1)

µs

INTERNAL CALENDAR

Year Date Range

2000

2255

Years

NAME

FROM

FUNCTION

VALUE

UNITS

VV3P3A

GNDA

Bypass capacitor for 3.3V supply

≥0.1±20%

µF

VV3P3D

GNDD

Bypass capacitor for 3.3V output

0.1 ±20%

µF

CSYS

VV3P3SYS

GNDD

Bypass capacitor for VV3P3SYS

≥1.0±30%

µF

CVDD

VDD

GNDD

Bypass capacitor for VDD

0.1 ±20%

µF

XTAL

XIN

XOUT

32.768 kHz crystal; electrically similar to ECS

.327-12.5-17X, Vishay XT26T or Suntsu SCP6–

32.768kHz TR (load capacitance 12.5pF)

32.768

kHz

CXS

(Note 2)

XIN

GNDA

Load capacitor values for crystal depend on crystal

specificationsandboardparasitics.Nominal

values are based on 3pF allowance for the sum

of board capacitance and chip capacitance.

22 ±10%

CXL

(Note 2)

XOUT

GNDA

22 ±10%

71M6545HT-IGTR/F Datasheet(PDF) 12 Page - Maxim Integrated Products

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