MAX14781E_14 Datasheet, PDF (14/19 Pages) Maxim Integrated Products – Half-Duplex RS-485 Transceiver with Polarity Correction

MAX14781E
Half-Duplex RS-485 Transceiver
with Polarity Correction
V_CC
10µs
TIMER
TIMER
5kΩ (typ)
DE
100µA
M1
500µA
M2
DRIVER
ENABLE
(HOT SWAP)
Figure 9. Simplified Structure of the Driver Enable Pin (DE)
Table 1. Polarity Detection Starting from Normal Polarity
DE RE
INPUTS
(VA - V_B) FOR TIME > t_PM
Open/Shorted
POLARITY
DETECTION
ON
POLARITY AFTER t_PM TIME
Normal/ Previous Detection Polarity
0
0
> -50mV
ON
Normal/ Previous Detection Polarity
< -200mV
ON
Inverted
1
1
X
OFF
Previous Detection Polarity
1
0
X
OFF
Previous Detection Polarity
0
1
X
OFF
Previous Detection Polarity
X = Don’t care
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