Q32M210 Datasheet, PDF (38/50 Pages) ON Semiconductor – Precision Mixed-Signal 32-bit Microcontroller SPI/SQI interface.

Q32M210
Detailed Function Descriptions
Powering
+5 V
from
USB
3.3 V ^{3.3 V}
Regulator
Optional (required for USB)
VDDUSB
VBAT
+3.3 V
from
+
−
battery
VBATA
VDDD
VDDIO0 VDDIO1
VDDD
Regulator
RTC
VCP
Regulator
Sensor
Interface,
IF5
Digital
Subsystem
including
ARM
Cortex−M3
Processor
VDBL
Charge Pump
VDBL
ILV
Optional (backlight)
Figure 23. Typical Powering Configuration
In the typical powering configuration the regulators, RTC,
and the sensor interface (including VADC and VREF) are
powered directly by the battery. The operating voltage
ranges and related parameters of sensor interface
components including the opamps, PGAs, DACs, and
switches are limited by the actual voltage level of the battery.
As the battery voltage changes over its life time the
operating ranges will change accordingly.
+5 V
from
USB
3.3 V ^{3.3 V}
Regulator
Optional (required for USB)
VDDUSB
VBAT
+3.3 V ₊
from _−
battery
VBATA
VDDD ^VDDIO0 VDDIO1
VDDD
Regulator
RTC
VCP
Regulator
Sensor
Interface,
IF5
Digital
Subsystem
including
ARM
Cortex−M3
Processor
VDBL
Charge Pump
VBATA provided by
charge pump
VDBL
ILV
Optional (backlight)
Figure 24. Extended Powering Configuration
In the extended powering configuration the regulators and
RTC are powered directly by the battery. The sensor
interface (including VADC and VREF) is supplied by the
on−chip charge pump. This is implemented by connecting
the VDBL pin to the VBATA pins externally. Since the VCP
regulator and charge pump are powered from VBAT, the
operating voltage for the sensor interface will be the VDBL
voltage. The operating voltage ranges and related
parameters of the sensor interface components including the
opamps, PGAs, DACs, and switches are limited by the fixed
voltage level of the VDBL.
As the battery voltage changes over its life time the
operating ranges will remain fixed as long as the battery
voltage is sufficient to operate the charge pump.
The external wakeup pins (IF5) are powered from
VBATA. To ensure proper powering of the wakeup pins
when in sleep mode and standby mode, an external diode
must be connected between the battery and VBATA pins.
This results in a suitable supply voltage on VBATA when the
charge pump is disabled.
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