Datasheet

PCA9601 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 2 — 6 May 2011 14 of 32
NXP Semiconductors
PCA9601
Dual bidirectional bus buffer
For more examples of faster alternatives for driving over longer cables such as Cat5
communication cable, see AN10658. Communication at 1 MHz is possible over short
cables and > 400 kHz is possible over 50 m of cable.
Fig 15. Driving ribbon or flat telephone cables
PCA9601
SCL
RX
TX
002aae87
9
SX
V
CC
TY
RY
SY
R2
R2
C2C2
I
2
C-BUS
MASTER
SDA
V
CC1
GND
R1 R1
BAT54A
cable
propagation
delay ≈ 5 ns/m
BAT54A
R1 R1
PCA9601
RX
TX
TY
RY
V
CC
SX
SY
R2
R2
SCL
SDA
V
CC2
GND
I
2
C-BUS
SLAVE(S)
C2C2
+V cable drive
Table 7. Examples of bus capability
Refer to Figure 15
.
V
CC1
(V)
+V
cable
(V)
V
CC2
(V)
R1
(Ω)
R2
(kΩ)
C2
(pF)
Cable
length
(m)
Cable
capacitance
Cable
delay
Set master
nominal SCL
Effective
bus
clock
speed
(kHz)
Max. slave
response
delay
HIGH
period
(ns)
LOW
period
(ns)
5 12 5 750 2.2 400 250 n/a
(delay based)
1.25 μs 600 3850 125 normal
specification
400 kHz parts
5 12 5 750 2.2 220 100 n/a
(delay based)
500 ns 600 2450 195 normal
specification
400 kHz parts
3.3 5 3.3 330 1 220 25 1 nF 125 ns 260 770 620 meets Fm+
specification
3.3 5 3.3 330 1 100 3 120 pF 15 ns 260 720 690 meets Fm+
specification