Sensors

7

Freescale Semiconductor, Inc.

MMA7660FC

Figure 3. Simplified Accelerometer Functional Block Diagram

ELECTRO STATIC DISCHARGE (ESD)

WARNING: This device is sensitive to electrostatic discharge.

Although the Freescale accelerometer contains internal 2000 V ESD protection circuitry, extra precaution must be taken by

the user to protect the chip from ESD. A charge of over 2000 V can accumulate on the human body or associated test equipment.

A charge of this magnitude can alter the performance or cause failure of the chip. When handling the accelerometer, proper ESD

precautions should be followed to avoid exposing the device to discharges which may be detrimental to its performance.

Table 2. Maximum Ratings

(Maximum ratings are the limits to which the device can be exposed without causing permanent damage.)

Rating

Symbol

Value

Unit

Maximum Acceleration (all axes, 100

μs)

10,000

g

Analog Supply Voltage

-0.3 to +3.6

V

Digital I/O pins Supply Voltage

-0.3 to +3.6

V

Drop Test

1.8

m

Storage Temperature Range

-40 to +125

°C

Table 3. ESD And Latch-up Protection Characteristics

Rating

Symbol

Value

Unit

Human Body Model

HBM

±2000

V

Machine Model

MM

±200

V

Charge Device Model

CDM

±500

V

±100

mA

AVDD

DVDD

VSS

X-axis

Transducer

Y-axis

Transducer

Z-axis

Transducer

MUX

CONTROL LOGIC

INT

C-to-V

CONVERTER

AMP

ADC

SDA

SCL

OFFSET

TRIM

GAIN

TRIM

INTERNAL

OSC

CLOCK

GEN