USB-FILESYS-SS HEXWAX, USB-FILESYS-SS Datasheet - Page 4

• Manufacturer Part Number: USB-FILESYS-SS
• Description: DRIVERFREE USB CONFIGURATION, 20SSOP
• Manufacturer: HEXWAX

Specifications of USB-FILESYS-SS

• Usb Type: FAT File System
• Usb Version: 2.0
• No. Of Ports: 1
• Supply Voltage Range: 1.8V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SSOP
• No. Of Pins: 20
• Package /: RoHS Compliant

In figure 4, the internal memory is used. Vto is gated by
P-channel mosfet T1 to provide power take-off circuit,
for example to provide power to a battery charger.
Oscillator X1/C2/C3 may be replaced by a low-cost
resonator, provided its frequency tolerance is greater
than 0.25%. C1 and C6 should be placed close to the
USB connector. C7 should be placed near the Vss and
Vdd pins of the USB-FileSys and is required only if it
would be some distance from C6. C8 is a filter capacitor
for an internal regulator and is required.
The TEAclipper connector is for in-circuit programming
of devices where the firmware has been purchased from
HexWax. It is recommended to allow firmware updates,
even if the firmware is initially supplied pre-programmed.
LED1 is a USB activity indicator. The Sleep pin must be
biased high if unused.
In figure 5, external memory is used. SW1 acts as a
media detect switch for an SD card.
memory is used, the Media input should instead be
biased low; if non-removable SD memory is used, the
Media input should instead be biased high.
p4 of 10
T1
Vdd
Vto
R1
C8
Figure 4. Typical Application Circuit, Internal Memory
Vdd
Vss
C4
R6
PTO#
C7
Vusb
Vss
TEAclipper
connector
C6
R40
26-Aug-10
C1
1
USB-FileSys
2
3
R2
4
5
MCU
Host
Vss
USB-S
OSC2
OSC1
TxRx
Gnd
Vcc
D+
D-
USB-FileSys / USB-Config
R44
R21
X1
C3
C2
If 25AA1024
LED1
Vdd
Vdd
Vdd
Vss
Vss
Vss
Vss
4
3
2
1
USB
In this implementation, two power sources are available:
power from the USB power input, and a battery Vbatt.
D1 and D2 ensure the higher of these is used to provide
the voltage Vdd. R3 ensures the USB-S power sense
signal is pulled low when the USB power is not present.
The USB voltage must be regulated to 3.3V if the serial
memory and/or host controller could not operate at 5V.
USB Connectors
Common USB connector and cable configurations are
shown in figure 6 and table 4.
connector should be left unconnected. The ID pin on
the mini connector permits the distinction of A and B
plugs. The micro connector pin-out is the same as the
mini connector.
For ultra-low cost products, it is possible to form a USB
Type-A plug direct from a circuit board as shown in
figure 6. This connector is only suitable for a limited
number of insertions (~50 before cleaning is required).
T1
Std Mini
Vdd
Vto
1
2
3
–
4
D1 and D2 should have a very low forward voltage – ideally 0.3V.
Pin
R1
1
2
3
4
5
Vdd
Vss
C8
Figure 5. Typical Application Circuit, External Memory
Vdd
Vss
Figure 6 Common USB pin-outs for male connectors
C4
Vdd
Vdd
Vdd
Vdd
R6
Name
Gnd
Vcc
D+
D–
ID
HW149-8
PTO#
R40-R43
C7
Vcc
Gnd
Vusb
Table 4. USB Connection Key
TEAclipper
connector
24AA1024
C6
Memory
Cable
Green
color
White
Black
Serial
Red
–
C1
1
USB-FileSys
2
SW1
3
Description
+5V (can dip to 4.08V)
Data –
Data +
Type A: Connect to ground
Type B: Not connected
Signal ground
R2
4
5
MCU
Host
Vss
USB-S
OSC2
OSC1
TxRx
Vcc
Gnd
D+
D-
The shield on the
R44
Vss
www.hexwax.com
R21
R3
X1
C3
C2
LED1
Vdd
Vdd
Vdd
Vss
Vss
D2
D1
Vss
Vss
Vbatt
4
3
2
1
USB