Linear Technology DC1880A, Демонстрационное руководство

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dc1880af
DEMO MANUAL DC1880A
Description
LTC2874
Quad IO-Link Master
Hot Swap Controller and PHY
Demonstration circuit 1880A showcases the LTC
®
2874 , a
quad Hot Swap™ controller and PHY suitable for IO-Link
®
master and other applications. DC1880A operates from
an external supply V
DD
and utilizes the DC590 USB serial
controller board to communicate with the LTC2874 using
SPI protocol.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap, QuikEval and Linduino are trademarks of Linear Technology Corporation. IO-Link is
a registered trademark of PROFIBUS User Organization (PNO). All other trademarks are the
property of their respective owners.
performance summary
Design files for this circuit board are available at
http://www.linear.com/demo/DC1880A
Specifications are at T
A
= 25°C, V
DD
= 24V, and V
L
= 3.3V.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
Input Supply Range 24VMODE = 0
24VMODE = 1
8
20
30
30
V
V
ΔV
ACL
L+ Analog Current Limit Voltage ΔV
ACL
= V
SENSE
+
– V
SENSE
–
V
L+
= 0V, FLDBK_MODE = 1
V
L+
= V
DD
– 1V
Start-Up, 2XPTC Enabled, V
L+
> 18V
9.2
42
16.7
50
100
24.2
58
mV
mV
mV
ΔV
GATE
External N-Channel Gate Drive
(V
GATE
– V
L+
)
I
GATE
= –1µA
V
DD
= 17V to 30V
V
DD
= 8V
10
4.5
13 15
15
V
V
V
V
RQH
,
V
RQL
CQ Residual Voltage Output High, I
CQ
= –100mA
Output Low, I
CQ
= 100mA
1.2
1.1
1.6
1.5
V
V
I
QPKH
,
I
QPKL
Wake-Up Request (WURQ) Current ±500 ±700 mA
I
QH
, I
QL
CQ Current Limit ±110 ±160 ±230 mA
f
DTR
Maximum Data Transfer Rate f
DTR
= 4nF
SLEW = 0
SLEW = 1
38.4
230.4
kb/s
kb/s
t
WU
WURQ Pulse Duration 75 80 85 µs
SCK Frequency 50% Duty Cycle 20 MHz