参数资料
| 型号： | USB-DAQ-SS |
| 厂商： | Flexipanel |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC SYSTEM DATA LOGGER 20-SSOP |
| 标准包装： | 25 |
| 系列： | * |
| 其它名称： | 658-1042-5 |
p5 of 8
26-Aug-10
USB-DAQ
HW147-5
www.hexwax.com
USB connector. C7 should be placed near the Vss and
Vdd pins of the USB-DAQ 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.
It is recommended to allow firmware updates, even if the
firmware is initially supplied pre-programmed. See the
TEAclipper programming section for details.
R3 pulls USB-S low when the USB connector is not
attached to a PC. R7 ensures the current is limited if
Vdd is below the USB supply voltage. Note how SCK-M
is biased low by R40. It must be low at startup, but may
otherwise be used as general I/O, as may the other
serial memory pins.
The OSCA and OSCB pins are not connected. There is
no real time clock and the event loop can only be
triggered by interrupt events.
M
ed
ia
/V
p
P
G
D
V
dd
V
ss
TEAclipper
connector 1
5
OSCA1
OSCA2
D+
Vusb
USB-DAQ
USB
C2
C3
X1
2
3
4
Vdd
Vss
P
G
C
1
2
3
4
Vss
D-
Vss
C1
C6
C7
V
ss
C8
Vss
R2
S
C
K
-M
USB-S
Vss
R40
General I/O
Vss
R3
R7
Figure 3. Typical Application Circuit, Internal Memory
Figure 4 shows a more advanced circuit with many
additional options added.
External memory is used.
SW1 acts as a media detect switch for an SD card. If
25AA1024 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.
Vto is gated by P-channel mosfet T1 to provide power
take-off circuit, for example to provide power to a battery
charger. C4 and R6 ensure the inrush current is not so
great as to cause a significant voltage drop.
In this circuit, 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 by Vdd. If the
serial memory cannot not operate at 5V, the USB power
should be regulated to 3.3V.
X2, C4 and C5 comprise a real time clock oscillator.
LED1 shows a typical LED indicator circuit.
M
ed
ia
/V
p
P
G
D
V
d
V
ss
TEAclipper
connector 1
5
OSCA1
OSCA2
D+
Vusb
USB-DAQ
USB
C2
C4
X1
2
3
4
Vdd
Vss
P
G
C
1
2
3
4
Vss
D-
Vss
C1
C6
C7
V
ss
C8
Vdd
Vss
TxRx
Vss
R21
R2
M
O
S
I-
M
IS
O
-M
S
C
K
-M
Serial
Memory
Vcc
Gnd
M
O
S
I
M
IS
O
S
C
K
S
n-
M
S
n
Vdd
Vss
USB-S
Vss
PTO#
Vbatt
Vdd
D1
D2
LED1
R3
Vdd
R40-R43
Vdd
SW1
General I/O
OSCB1
OSCB2
C3
C5
X2
Vss
Vdd
Vto
T1
R1
R6
C9
Figure 4. Typical Application Circuit, External Memory
D1 and D2 should have a very low forward voltage – ideally 0.3V.
USB Connectors
Common USB connector and cable configurations are
shown in figure 5 and table 6.
The shield on the
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.
Figure 5 Common USB pin-outs for male connectors
Table 6. USB Connection Key
Pin
Std Mini
Name
Cable
color
Description
1
Vcc
Red
+5V (can dip to 4.08V)
2
D–
White
Data –
3
D+
Green
Data +
–
4
ID
–
Type A: Connect to ground
Type B: Not connected
4
5
Gnd
Black
Signal ground
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).
It is unshielded and recommended only for ‘dongle’ type
products with no cables attached.
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