MAXQ7666 datasheet(9/49 Pages) MAXIM

9 / 49 page

16-Bit, RISC, Microcontroller-Based,

Smart Data-Acquisition System

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AVDD = DVDDIO = +5.0V, DVDD = +3.3V, fSYSCLK = 8MHz, VREFDAC = VREFADC = +5V, TA = TMIN to TMAX, unless otherwise noted.

Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SUPPLY VOLTAGE SUPERVISORS AND BROWNOUT DETECTION

DVDD Voltage-Supervisor Reset

Rising Threshold

Power-on default, DVDD voltage rising

(Note 8)

2.70

2.99

VDBR = 00b

(default)

2.70

2.99

VDBR = 01b

2.77

3.06

VDBR = 10b

2.84

3.13

DVDD Voltage-Supervisor

Brownout Reset Falling Threshold

VVDBR

DVDD voltage falling,

firmware selectable,

measured with CPU

active at 8MHz

(Note 9)

VDBR = 11b

2.91

3.20

VDBI = 00b

(default)

2.77

2.99

VDBI = 01b

2.84

3.13

VDBI = 10b

2.91

3.20

Software-Selectable DVDD

Voltage-Supervisor Brownout

Interrupt Falling Threshold

VVDBI

DVDD voltage falling,

firmware selectable,

measured with CPU

active at 8MHz

(Note 10)

VDBI = 11b

2.99

3.27

VIOBI = 00b

(default)

4.25

4.74

VIOBI = 01b

4.30

4.79

VIOBI = 10b

4.35

4.84

DVDDIO Voltage-Supervisor

Brownout Interrupt Threshold

VVIOBI

DVDDIO voltage falling,

firmware selectable,

measured with CPU

active at 8MHz

(Note 11)

VIOBI = 11b

4.40

4.89

Voltage-Supervisor Hysteresis

DVDD, DVDDIO

DVDD Brownout-Interrupt to

Brownout Reset Falling Threshold

Voltage difference between VVDBI and

VVDBR, time allowing software clean-up

before

RESET asserted, VDBI = 11b and

VDBR = 10b

155

Voltage Monitor Supply Voltage

Range

DVDD

1.0

3.6

DVDD Ramp-Up Rate

Ensure DVDD rises faster than this rate

between +2.7V and +3.0V when using

either an external DVDD supply or the

internal linear regulator

mV/ms

RESET Hold Time

After DVDD rises above the VVDBR voltage

trip threshold

CAN INTERFACE

CAN Baud Rate

CANCLK = 8MHz

Mbps

CANCLK Mean Frequency Error

50ppm external crystal error, 8MHz crystal

ppm

CANCLK Total Frequency Error

50ppm external crystal error, 8MHz crystal,

clock divided and measured over 500µs

interval, mean plus peak cycle jitter

< 0.5

HIGH-FREQUENCY CRYSTAL OSCILLATOR

Using external crystal

7.6

8.12

Clock Frequency

External clock source

7.6

8.12

MHz

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