Datasheet

LPC2141_42_44_46_48_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet Rev. 02 — 28 August 2006 33 of 39
Philips Semiconductors
LPC2141/42/44/46/48
Single-chip 16-bit/32-bit microcontrollers
9.1 Timing
10. Application information
10.1 Suggested USB interface solutions
Fig 8. External clock timing
t
CHCL
t
CLCX
t
CHCX
T
cy(clk)
t
CLCH
002aaa907
0.2V
DD
+ 0.9 V
0.2V
DD
− 0.1 V
V
DD
− 0.5 V
0.45 V
Fig 9. Differential data-to-EOP transition skew and EOP width
002aab561
t
PERIOD
differential
data lines
crossover point
source EOP width: t
FEOPT
receiver EOP width: t
EOPR1
, t
EOPR2
crossover point
extended
differential data to
SEO/EOP skew
n * t
PERIOD
+ t
FDEOP
Fig 10. LPC2141/42/44/46/48 USB interface using the CONNECT function on pin 17
LPC2141/42/
44/46/48
USB-B
connector
D+
CONNECT
soft-connect switch
D−
VBUS
V
SS
V
DD
R1
1.5 kΩ
R
S
= 33 Ω
002aab563
R
S
= 33 Ω