參數(shù)資料
型號(hào): STR912FAW32H6T
廠商: 意法半導(dǎo)體
英文描述: ARM966E-S⑩ 16/32-Bit Flash MCU with Ethernet, USB, CAN, AC motor control, 4 timers, ADC, RTC, DMA
中文描述: ARM966E -虜⑩16/32位閃存微控制器與以太網(wǎng),USB,加拿大,交流電機(jī)控制,4個(gè)定時(shí)器,模數(shù)轉(zhuǎn)換器,RTC和DMA的
文件頁(yè)數(shù): 24/99頁(yè)
文件大小: 979K
代理商: STR912FAW32H6T
Functional overview
STR91xFAx32 STR91xFAx42 STR91xFAx44
24/99
Mode. The entire chip is quiescent (except for RTC and wake-up circuitry). There are three
means to exit Sleep Mode and re-start the system:
Some resets (external reset pin, low-voltage, power-up, JTAG debug command)
RTC alarm
Input from wake-up unit
3.12
Voltage supplies
The STR91xFA 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.
3.12.1
Independent A/D converter supply and reference voltage
The ADC unit on 128-pin and 144-ball packages has an isolated analog voltage supply input
at pin AVDD to accept a very clean voltage source, independent of the digital voltage
supplies. Additionally, an isolated analog supply ground connection is provided on pin AVSS
only on 128-pin and 144-ball 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 STR91xFA device on pin AVSS_VSSQ.
A separate external analog reference voltage input for the ADC unit is available on 128-pin
and 144-ball packages at the AVREF pin for better accuracy on low voltage inputs. For 80-
pin packages, the ADC reference voltage is tied internally to the ADC unit supply voltage at
pin AVREF_AVDD, meaning the ADC reference voltage is fixed to the ADC unit supply
voltage.
See
Table 12: Operating conditions
, for restrictions to the relative voltage levels of VDDQ,
AVDD, AVREF, and AVREF_AVDD.
3.12.2
Battery supply
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 main digital supplies (V
DD
and
V
DDQ)
. The SRAM will automatically switch its supply from the internal V
DD
source to the
VBATT pin when the voltage of V
DD
drops below the LVD threshold (and not V
BAT
). In order
to use the battery supply, the LVD must be enabled.
The VBATT pin also supplies power to the RTC unit, allowing the RTC to function even when
the main digital supplies (V
DD
and V
DDQ
) are switched off. By configuring the RTC register,
it is possible to select whether or not to power from VBATT only the RTC unit, or power the
RTC unit and the SRAM when the STR91xFA device is powered off.
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