E981.03A38HB ELMOS Semiconductor, E981.03A38HB Datasheet - Page 19

• Manufacturer Part Number: E981.03A38HB
• Description: Interface - Specialized KNX/EIB transceiver
• Manufacturer: ELMOS Semiconductor

Specifications of E981.03A38HB

• Rohs: yes
• Product Type: KNX/EIB Transceiver
• Operating Supply Voltage: 3.3 V
• Supply Current: 10 mA
• Maximum Power Dissipation: 1 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C

6.1 Reset / Power Up-&Down Sequence
6.2 Overall
To ensure a stable function under all conditions the E981.03 supports several power up and power down scenarios.
The status of the configurable supply management/ monitoring can be queried via UART and digital SAVE pin at any
time.
Properties
Power Up Sequence
• Hard Reset Mode
• Start Up Mode
• Soft Reset
Power Down Sequence
• Save Mode
• Internal Reset
6.3 Undervoltage Condition
With falling bus voltage (data point 1) VST falls, too.
When V
er is higher) V20 is switched off (data point 2). V
rise in typical case of high V20 load resulting in pulsed
activation of V20.
When V
tivated to initiate the save routines of host processor
(data point 3). The DC/DC converter continues its nor-
mal operation until V
verter input voltage V
(or output compare
agement) make a switchover to V
(data point 4). To avoid bus overload soft start phase
with bus current reduction is activated in case of ac-
tive SAVE.
The RESET signal is activated when V
ELMOS Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
KNX/ EIB TRANSCEIVER
PRODUCTION DATA - JUL 2, 2012
ELMOS Semiconductor AG
VST
VST
is below either V
falls below V
Figure 6 Configurable Power Man-
VST
VCC
falls below the minimum con-
VST,save,HL
switch off and the V
V33I not ok
external supply voltage switch on dependent on capacitance the Power Up
Sequence stays longer in this mode
E981.03 will be set to soft reset value.
SAVE pin is active (low)
Hard Reset Mode
V20,off,abs
the SAVE signal is ac-
VST
or V
without a fail time
VCC
V20,off,rel
falls below the
(whichev-
V33I
VST
input
will
Data Sheet
19/51
threshold V
recovers now (data point 5) the IC come back with-
out internal reset. SAVE will be deactivated, when V
achieves the value V
activated, when V
point 7). The IC is back on regular condition after V
achieves V
ing V
Power
is in a valid range for 3.3V otherwise the Input of the
internal V
V
covers.
The 2
fore, but now the V
will be reset when V
point 14).
33I
regulator switch to V
VCC
nd
Management) make a switchover to V
case with data point 10 to 14 is like the case be-
the V
33I
BUSP
RESET,HL
regulator switch to V
33I
- V
output (compare
(short after data point 4). If the BUSP
VST_drop
VST
VST
33I
VST,save,LH
achieves the value V
is lower than V
drop deeper and finally E981.03
(data point 8). With the return-
V33I
output. And finally V20 re-
(data point 6). V
QM-No.: 25DS0046E.01
Figure 6 Configurable
VST
and the output of
33I
, reset, act (data
E981.03
VST,VCCon
VCC
VCC
will be
if V
(data
VCC
VST
VST