STR912FW42X6 STMicroelectronics, STR912FW42X6 Datasheet - Page 18

• Manufacturer Part Number: STR912FW42X6
• Description: MCU 256K FLASH 96K SRAM USB CAN
• Manufacturer: STMicroelectronics
• Series: STR9r

Specifications of STR912FW42X6

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 96MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, IrDA, Microwire, SPI, SSI, SSP, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 80
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 96K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 2 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 128-LQFP
• For Use With: 497-8267 - BOARD EVAL BASED ON STR9MCBSTR9UME - BOARD EVAL MCBSTR9 + ULINK-MEMCBSTR9U - BOARD EVAL MCBSTR9 + ULINK2497-5859 - EVAL BRD FULL USB DONGLE STR912MCBSTR9 - BOARD EVAL STM STR9 SERIES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: 497-5062; 497-5062-2; 497-5062-2; STR912FW42X6T

Functional overview
2.12
2.12.1 Independent A/D converter supply and reference voltage
2.12.2 Battery supply
18/73
●
●
●
Voltage supplies
The STR91xF requires two separate operating voltage supplies. The CPU and memories
operate from a 1.65V to 2.0V on the VDD pins, and the I/O ring operates at 2.7V to 3.6V on the
VDDQ pins.
The ADC unit on 128-pin packages has an isolated analog voltage supply input at pin AVDD to
accept a very clean voltage source, independent of the digital voltage supplies. The analog
voltage supply range on pin AVDD is the same range as the digital voltage supply on pin
VDDQ. Additionally, an isolated analog supply ground connection is provided on pin AVSS only
on 128-pin packages for further ADC supply isolation. On 80-pin packages, the analog voltage
supply is shared with the ADC reference voltage pin (as described next), and the analog ground
is shared with the digital ground at a single point in the STR91xF device on pin AVSS_VSSQ.
A separate external analog reference voltage input for the ADC unit is available on 128-pin
packages at the AVREF pin for better accuracy on low voltage inputs, and the voltage on
AVREF can range from 1.0V to V
internally to the ADC unit supply voltage at pin AVCC_AVREF, meaning the ADC reference
voltage is fixed to the ADC unit supply voltage.
An optional stand-by voltage from a battery or other source may be connected to pin VBATT to
retain the contents of SRAM in the event of a loss of the V
automatically switch its supply from the internal V
of V
The VBATT pin also supplies power to the RTC unit, allowing the RTC to function even when
the main digital supplies (V
possible to select whether or not to power from VBATT only the RTC unit, or power the RTC unit
and the SRAM when the STR91xF device is powered off.
DD
Some resets (external reset pin, low-voltage, power-up, JTAG debug command)
RTC alarm
Input from wake-up unit
drops below that of VBATT.
DD
and V
DDQ
DDQ
. For 80-pin packages, the ADC reference voltage is tied
) are switched off. By configuring the RTC register, it is
DD
source to the VBATT pin when the voltage
DD
supply. The SRAM will
STR91xF