Page 81 - ARM Based Microcontroller Projects Using MBED

6.2 KEY FEATURES OF THE STM32F411RET6 MICROCONTROLLER 67
TABLE 6.2 Current Characteristics of the STM32F411RET6 Microcontroller
Symbol Ratings Max. Unit
Total current into sum of all V DD _ x power lines (source) a 160 mA
ΣI VDD
ΣI VSS Total current out of sum of all V SS _ x ground lines (sink) a 160
I VDD Maximum current into each V DD _ x power line (source) a 100
I VSS Maximum current out of each V SS _ x ground line (sink) a 100
I IO Output current sunk by any I/O and control pin 25
Output current sourced by any I/O and control pin 25

ΣI IO Total output current sunk by sum of all I/O and control pins b 120
Total output current sourced by sum of all l/Os and control pins b 120
c d
I INJ(PIN) Injected current on FT and TC pins 5/+0
Injected current on NRST and B pins d
Total injected current (sum of all I/O and control pins) e 25
ΣI INJ(PIN)
a
All main power and ground pins must always be connected to the external power supply.
b
This current consumption must correct be distributed over all I/O and control pins.
c
Negative injection disturbs the analog performance of the device.
d
Positive injection is not possible on these pins.
e
When several inputs are submitted to current injection, the maximum is the absolute sum of the positive and negative injected currents.
devices requiring more than 20mA are connected to an I/O pin. Also, the total current of all
the I/O pins should not exceed 100mA.
6.2.3 The Interrupt Controller

A nested vectored interrupt controller is available on the microcontroller which can man-
age 16 interrupt priority levels, and can handle up to 62 maskable interrupt channels with
16 interrupt lines of the Cortex-M4. Interrupt management is provided with minimal inter-
rupt latency which allows early processing of interrupts. The processor state is automatically
saved on entry to an interrupt, and restored on interrupt exit, with no instruction overhead.

6.2.4 The Analog-to-Digital Converter (ADC)

A successive approximation ADC is used with the following specifications:
• 12-bit resolution
• 5.33Msps conversion rate (higher for lower resolution)
• 18.75ns sampling time
• Up to 16 channels
• Internal reference voltage
• Single-ended and differential mode inputs
• Dual clock operation
• Single-shot or continuous mode
• Multiple trigger inputs