MMA6222EG

Sensors

Freescale Semiconductor

11

2.4

CONTROL TIMING

Notes:

1. Functionality verified 100% via scan. Timing characteristic is directly determined by internal oscillator frequency.

2. Verified by characterization, not tested in production.

3. Parameters tested 100% at final test.

4. Parameters tested 100% at unit probe.

5. Devices are trimmed at 100 Hz with 1000 Hz low-pass filter option selected.

6. Cutoff frequencies shown are -4dB referenced to 0 Hz response, to correspond with previous specifications.

Ref

Characteristic

Symbol

Min

Typ

Max

Units

106

107

DSP Low-Pass Filter (5)

Cutoff frequency (6)

DSP Low-Pass Filter

Cutoff frequency (-3dB, referenced to 0 Hz)

380

335

400

353

420

371

Hz

Hz

(1)

(1)

108

109

DSP High-Pass Filter

Cutoff frequency

Filter Order

0.095

—

0.1

1

0.105

—

Hz

1

(1)

(1)

110

111

Power-On Recovery Time

POR negated to CS low

—

—

—

—

840

10

μs

ms

(1)

(2)

112 Internal Oscillator Frequency

3.8

4.0

4.2

MHz

(3)

113 Clock Monitor Threshold

3.6

—

4.4

MHz

(1)

114 Chip Select to Internal Reset (See Figure 2-3)

486

512

538

μs

(1)

115

116

117

118

119

120

121

Serial Interface Timing (See Figure 2-4)

Clock period

CS asserted to SCLK high

Data setup time

Data hold time

SCLK low to data out

SCLK high to CS negated

CS negated to CS asserted

120

60

20

10

—

60

526

—

—

—

—

—

—

—

—

—

—

—

50

—

—

ns

ns

ns

ns

ns

ns

ns

(1)

(1)

(1)

(1)

(1)

(1)

(1)

122

DAC Low-Pass Filter

Cutoff Frequency

5

10

20

kHz

(4)

123 Sensing Element Rolloff Frequency (-3 dB)

—

3

—

kHz

(2)