E981.12A39BB ELMOS Semiconductor, E981.12A39BB Datasheet - Page 41

• Manufacturer Part Number: E981.12A39BB
• Description: Interface - Specialized Dual I/O Link Master Transciever
• Manufacturer: ELMOS Semiconductor

Specifications of E981.12A39BB

• Rohs: yes
• Product Type: Dual I/O link Master Transceiver
• Operating Supply Voltage: 3.3 V
• Supply Current: 5.5 mA
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-44
• Minimum Operating Temperature: - 40 C

Dual IO-Link Master Transceiver with UARTS
ADVANCE PRODUCT INFORMATION - JUL 26, 2011
6.7
The IO-Link Supply Control controls the supply voltage Lx using an external PMOS power MOSFETs
The following figure (Fig. 21) shows the principle.
The FET can be activated or deactivated by SPI register PDR_CFG1.
To limit the current in case of failures the current is measured using an external shunt resistor. If a
certain voltage drop is detected at the shunt resistor the overcurrent condition is set in SPI register and
optionally an interrupt can be generated. The overcurrent detection threshold is scaled by the external
shunt resistor. I
The gate of the external FET is controlled to limit the current. The current limit is calculated by the
external shunt resistor. I
1A). The external FET is switched off after a configurable time to limit power dissipation in this state.
This event can be signalled by interrupt if enabled by OcxIE in register PDR_CFG2.
After a configurable off-time the driver is switched on automatically. The dutycycle of this cyclic
switching must be configured in register PDR_CFG1 to keep the external FET within the safe operating
area. By configuring this register both - automatic switch-off and automatic switch-on can be disabled.
If automatic switch-on is disabled the FET can be enabled after a shutdown by reading the register
PDR_STAT.
If the bit HARDSW in the register PDR_CFG2 is set, the PMOS-Driver works simply as a switch. In
case of detecting overcurrent at the external shunt the external FET is switched off immidiately. In this
mode cyclic switching is disbled. To enable the FET after a shutdown register PDR_STAT has to be
read.
This document contains information on a new product. ELMOS Semiconductor AG reserves the right to change specifications and information herein without notice.
ELMOS Semiconductor AG
IO-Link Supply Control
TH(OC)
is typically V
VDDH
E981.12
TH(LIM)
is calculated as V
IN_OCCOMP
R
Fig. 21: IO-Link Supply Control
SHUNT
/ R
Data Sheet 41 / 44
shunt
IN_OC
(e.g. I
/ R
LIM
shunt
Driver
Gate
typically 90mV / 100mOhm = 0.9A).
(e.g. I
TH(LIM)
typically 100mV / 100mOhm =
QM-No.: 25DS0069E.00
Lx
E981.12