E520.35B62AC ELMOS Semiconductor, E520.35B62AC Datasheet - Page 15

• Manufacturer Part Number: E520.35B62AC
• Description: LIN Transceivers LIN SBC with VR & Watchdog
• Manufacturer: ELMOS Semiconductor

Specifications of E520.35B62AC

• Rohs: yes
• Operating Supply Voltage: 5 V
• Supply Current: 10 mA
• Maximum Operating Temperature: + 125 C
• Package / Case: QFN-20
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

LIN SBC with Voltage Regulator and Watchdog
ADVANCE PRODUCT INFORMATION JUL 26, 2011
6 Functional Description
The E520.35 is the interface between the physical bus in a Local Interconnect Network (LIN) and the
LIN master / slave protocol controller according to LIN 2.1 specification. The device provides local and
remote wake-up capability in sleep and standby mode. A wake-up source flag can be evaluated by the
microcontroller. The integrated TXD dominant clamp timeout prevents the LIN network from permanent
distortion in case of hardware failure. The flash mode provides higher datarates on the LIN pin for
end-of-line or in-car flashing up to 115 kBaud.
The integrated voltage regulator supplies the microcontroller and peripheral blocks with current up to
60mA (2% accuracy). A higher current up to 100mA can be supplied with lower accuracy. For
applications with a permanent supplied microcontroller a standby mode with active voltage regulator
and low quiecent current consumption is implemented.
The cycle time of the integrated window watchdog can be configured by external resistor. For software
development purpose the watchdog can be disabled.
The integrated reverse polarity protected 6:1 voltage divider can be connected to the battery supply to
measure the supply voltage with fast response time. To limit the output voltage in case of VBAT
overvoltage a clamping to the microcontroller supply voltage is integrated.
6.1
The E520.35 provides the following operation modes:
6.1.1
The device enters Power-off mode in case the battery voltage is lower than V
Power-off mode the voltage regulator is switched off. If the battery voltage rises above the power on
reset threshold level V
mode Power-On.
6.1.2
When the voltage at pin VS exceeds the Power-on-reset threshold voltage V
power-on mode. In that mode the voltage regulator is switched on. After pin VDD exceeds V
RES_N is held low for t
t
Any wake-up request from mode SLEEP is indicated by setting the pin RXD to LOW level.
The wake-up source can be recognized by the microcontroller by reading the level at pin TXD. A weak
pull up indicates a remote wake-up request and strong pull down indicates a local wake-up request.
Note: The voltage regulator over temperature shut down results in a transition to Power-on mode and
the regulator is switched off. The voltage regulator will be switched on if the junction temperature falls
below the specified temperature hysteresis T
ELMOS Semiconductor AG
2AM
the device enters active mode.
Operating Modes
Power-off mode
Power-on mode
S,POR
RES_N
the device resets the system via activating pin RES_N. The device enters
. Now with setting pin EN to active HIGH level for a time period of at least
Data Sheet 15 / 29
HYST
.
S,POR
S,PD
QM-No.: 25DS0060E.00
, the device enters
voltage level. In
DD,RSTD
E520.35
,