MMA7660FCR1 Freescale Semiconductor, MMA7660FCR1 Datasheet - Page 10

• Manufacturer Part Number: MMA7660FCR1
• Description: Board Mount Accelerometers 3-Axis Digital Out Accelerometer
• Manufacturer: Freescale Semiconductor

Specifications of MMA7660FCR1

• Sensing Axis: X, Y, Z
• Acceleration: 1.5 g
• Digital Output - Number Of Bits: 6 bit
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Digital Output - Bus Interface: 12 C
• Sensitivity: 21.33 count/g
• Package / Case: DFN-10
• Output Type: Digital
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 5. Modes Of Operation
MODES OF OPERATION
consumption options. The sensor is only capable of running in one of these modes at a time.
analog supply. See
providing a significant reduction in operating current. When the device is in Standby Mode the current will be reduced to
approximately 3 µA. Standby Mode is entered as soon as both analog and digital power supplies are up. In this mode, the device
can read and write to the registers with I
the MODE (0x07) control register by accessing the mode bit in the Mode register.
Shake Detection, Tap Detection, Orientation Detection, and/or Auto-Wake/Sleep Feature and in this mode the digital analysis for
any of these functions is done. The user can configure the samples per second to any of the following: 1 sample/second,
2 samples/second, 4 samples/second, 8 samples/second, 16 samples/second, 32 samples/second, 64 samples/second, and
120 samples/second, for the Auto-Sleep state. If the user is configuring the Auto-Wake feature, the selectable ranges are:
1 sample/second, 8 samples/second, 16 samples/seconds and 32 samples/second. Depending on the samples per second
selected the power consumption will vary.
Sensors
Freescale Semiconductor
Measurement and
Standby Mode
The sensor has three power modes: Off Mode, Standby Mode, and Active Mode to offer the customer different power
The Off Mode offers the lowest power consumption, approximately 0.4 µA and can only be reached by powering down the
The Standby Mode is ideal for battery operated products. When Standby Mode is active the device outputs are turned off
During the Active Mode, continuous measurement on all three axes is enabled. In addition, the user can choose to enable:
Power Mode
Power Down
Active Mode
Auto-Sleep
Auto-Wake
Off Mode
Mode
MMA7660FC will not respond, but I
DVDD is down, so I
used for other devices (MMA7660FC
(MMA7660FC does not load I
Figure
MMA7660FC will respond to I
MMA7660FC will respond to I
bus can be used for other devices
clamps I
5. In this mode, there is no analog supply and all I
2
C bus to DVVD pin)
I²C Bus
2
C bus cannot be
2
C, but no new measurements can be taken. The mode of the device is controlled through
Figure 5. State Machine of Modes
2
2
2
C bus)
C bus
C bus
2
C
DVDD AVDD
Off
Off
On
On
On
Off
On
Off
On
On
MMA7660FC is powered down in both supplies. I
unavailable on bus.
MMA7660FC is powered down in digital supply but not analog
supply. I
requires 50 msec.
MMA7660FC is powered down in analog supply but not digital
supply. I
MMA7660FC is powered up in both supplies, so registers can be
accessed normally to set MMA7660FC to Active Mode when
desired. MMA7660FC's sensor measurement system is idle.
MMA7660FC is able to operate sensor measurement system at
user programmable samples per second and run all of the digital
analysis functions. Tap detection operates in Active Mode and
Auto-Sleep, but not Auto-Wake.
2
2
2
C activity is unavailable on bus. AVDD power cycling
C activity is ignored.
C activity is ignored.
Function
2
C activity is
MMA7660FC
10