Key Features .................................................................................................................................................3
2.2
Example Applications ...................................................................................................................................3
Power Supply ...............................................................................................................................................9
Real Time Clock ............................................................................................................................................9
8.5
USB PHY........................................................................................................................................................9
Serial Interfaces............................................................................................................................................9
10 Revision History ..................................................................................................................................................12
Rev 1.0
2
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GHI Electronics, LLC
Introduction
Preliminary F40 SoC Datasheet
2
Introduction
The F40 SoC (previously known as ALFAT) is a small, low cost, and low power hardware file system solution.
Through the F40 SoC, simple commands are used to access files on USB drives and SD, SDHC, and MMC memory
cards. The F40 SoC can also read keystrokes from keyboards. Commands can be transmitted over UART, SPI, or I2C.
Throughout this document, the F40 SoC will be referred to as the F40. For detailed command descriptions and
device behavior, please the file system user manual.
For advanced electrical characteristics and details on the underlying STM32F205RBT6 processor, please consult the
processor’s datasheet.
2.1
2.2
Key Features
Serial UART, SPI, and I2C command interfaces
File reading, writing, and deleting
Long File Name support
FAT16 and FAT32
Access up to 16 files simultaneously
USB storage device support
Built in 2x USB 2.0 Full Speed PHY
Support for one High Speed ULPI USB PHY
4-bit SD/MMC storage support
SD-Reader mode for accessing SD cards through USB
Up to 4 Mbytes/s file access speed on SD and USB High Speed
Up to 1 Mbytes/s file access speed on USB Full Speed
Quick file-close pin for closing files on power loss
Read keystrokes from USB keyboards
Simulate an SD card reader
Built in RTC with a separate power domain
LQFP64 10 x 10 mm
40 mA run and as low as 0.1 μA sleep
-40°C to +85°C operational
RoHS Lead Free
Example Applications
Data loggers
Automated machinery
Consumer products
Rev 1.0
3
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Pinout Table
Preliminary F40 SoC Datasheet
3
Pinout Table
Any pin with no function or note must be left unconnected. All I/Os are 5 V tolerant except the reset pin.
Pin
1
2
3
4
5
6
7
1,2,9
8
3
9
10
3
11
3
12
13
14
11
15
16
17
3
18
19
20
21
3
22
23
11
24
4
25
2,4
26
3
27
3
28
5
29
3
30
3
31
6
32
1
2
Function
VBAT
RTC XTAL IN
RTC XTAL OUT
SYS XTAL IN
SYS XTAL OUT
RESET
USB1 ULPI STP
USB1 ULPI DIR
USB1 ULPI NXT
GND
3.3 V
WAKEUP
FLUSH
USB1 ULPI D0
GND
3.3 V
DATA READY
USB1 ULPI CK
SPI MISO
UART BUSY
SPI MOSI
SD WRITE PROTECT
SD CARD DETECT
USB1 ULPI D1
USB1 ULPI D2
USB1 ULPI D3
USB1 ULPI D4
3.3 V
Pin
33
3
34
3
35
7
36
7
37
38
39
8
40
8
41
3
42
43
9
44
10
45
10
46
47
6
48
49
50
11
51
8
52
8
53
54
8
55
2,12
56
57
3,9
58
59
60
61
62
63
64
Function
USB1 ULPI D5
USB1 ULPI D6
USB1 D-
USB1 D+
SD D0
SD D1
USB1 ULPI 19.2 MHz
UART TX
I2C SDR CONNECT
UART RX
SPI BUSY
I2C BUSY
USB0 D-
USB0 D+
3.3 V
SPI SSEL
SD D2
SD D3
SD CLOCK
SD COMMAND
SPI CLOCK
BAUD CONTROL
I2C SCL
USB1 ULPI D7
UART SDR CONNECT
I2C SDA
SPI SDR CONNECT
GND
3.3 V
Not 5 V tolerant
Active low
3
Connect only if ULPI High Speed PHY is used
4
Connect to GND if unused
5
Requires a 10,000 Ω pull-down resistor
6
Requires a 2.2 μF capacitor to GND
7
No connect if a High Speed PHY is used, otherwise requires a 22 Ω resistor in series
8
Requires a 47,000 Ω pull-up resistor
9
Requires a 10,000 Ω pull-up resistor
10
Requires a 22 Ω resistor in series
11
Interally pulled low
12
Interally pulled high
Rev 1.0
4
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GHI Electronics, LLC
Reference Design
Preliminary F40 SoC Datasheet
4
Reference Design
The ALFAT OEM board and ALFAT SDR board are excellent starting points and reference designs for the F40 in both
default and SD-Reader mode. See the product catalog entries for more information and additional resources.
The ALFAT Evaluation Kit is the best way to start evaluating the F40. The kit includes an evaluation host board and
the ALFAT OEM and the ALFAT SDR boards. The host board can be easily connected to any PC using the included
USB cable. The included explorer software can be used for visualizing of the command set.
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