mma1605nwr2 Freescale Semiconductor, Inc, mma1605nwr2 Datasheet - Page 18

• Manufacturer Part Number: mma1605nwr2
• Description: Dsi Inertial Sensor
• Manufacturer: Freescale Semiconductor, Inc

18
3.3
regulators for the analog (V
HCAP and internal voltages have stabilized sufficiently for proper operation. The voltage monitor asserts internal reset when the
HCAP supply or internally regulated voltages fall below predetermined levels. A reference generator provides a stable voltage
which is used by the ΣΔ converter.
3.3.1
stability.
3.3.2
2, the device will be reset within the reset delay time (t
MMA16xxNW
HCAP
The device derives its internal supply voltage from the HCAP supply voltage. The device includes separate internal voltage
The voltage regulator module includes voltage monitoring circuitry which holds the device in reset following power-on until the
The internal regulator requires an external capacitor between the C
The device includes a circuit to monitor the voltage on the HCAP pin. If the voltage falls below the specified threshold in
Figure 1
VOLTAGE REGULATORS
C
V
HCAP
REG
and C
shows the recommended types and values for each of these capacitors.
Voltage Monitor
REFERENCE
BANDGAP
V
HCAP
V
REGA
V
REGULATOR
REGA
REG
REF
VOLTAGE
REGA
Regulator Capacitor
V
) and digital circuitry (V
REGA
V
REF
V
Figure 9. Voltage Regulation and Monitoring
BUF
COMPARATOR
COMPARATOR
COMPARATOR
REGULATOR
VOLTAGE
V
REGULATOR
BUF
VOLTAGE
HCAP_POR
GENERATOR
REG
REFERENCE
). External filter capacitors are required, as shown in
Analog Filter Delay
Analog Filter Delay
) specified in
Digital Delay
t
t
t
VREG_POR
VREG_POR
V
HCAP_POR
REG
REG
V
GENERATOR
= 2.50 V
REF_MOD
pin and V
TRIM
BIAS
Section
= 1.250 V
SS
2.7.
pin, and the C
V
OSCILLATOR
CONVERTER
REGA
DIGITAL
ARRAY
LOGIC
TRIM
OTP
DSP
= 2.50 V
ΣΔ
POR
REGA
Freescale Semiconductor
pin and V
Figure
C
C
REGA
REG
SSA
Sensors
Section
1.
pin for