E981.03A38HB ELMOS Semiconductor, E981.03A38HB Datasheet - Page 17

• 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

5.7 E981.03 System Functions
5.8 Power Supply
The supply blocks generates a 20V application volt-
age V
5V/3.3V output voltage V
by internal components of the E981.03. The voltages V
and V
The voltages V
recommendation is not use this pin for other supplies!
The voltage V
age for external supplies is not recommended because it
disturb the autonomous power management of the IC!
To prevent a overload and a fast load slope on the bus
the power management of the IC generates a variable
storage voltage V
rent I
I
or UART – Service. The value of V
without an overload condition is V
power which is continuously useable is (V
* I
drops below V
To prevent a unpredictable crash the supplies have the
following prioritization:
ELMOS Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
REF
V
KNX/ EIB TRANSCEIVER
PRODUCTION DATA - JUL 2, 2012
ELMOS Semiconductor AG
BUSP
REF
and the maximum slope are configurable through SPI
. If more power is used the C
REF
V20
VCC
and a limited slope of I
, a variable storage voltage VST, a configurable
If the I
V
can be used to supply external components.
VST_drop
VST
VST
(15)
BUSP
V33I
LOAD_SUM
BUSP
is externally blocked. Usage of this volt-
VST
C
– V
I
D
VST
ST
is externally blocked but the strictly
. This voltage has a limited input cur-
I
V
I
supply
REF
VST_DROP
LOAD_SUM
V20
(14)
VST
bus current
source
V20
<= I
is higher then I
VCC
C
BUSP,MAX
V20
I
Switch C
V20
.
and a 3.3V voltage V
V
V20
REF
. The maximum current
supply
VST
V33I
ST
0
1
in normal operation
BUSP
is discharging, V
GND
Figure 6. Configurable Power Management
2
I
V33I
V33I
(6)
BUSP,MAX
Switch A
2
– V
BUSP
C
33I
1
Switch B
VST_DROP
V
the C
– V
VIO
(19)
V33I
V33I
VST_DROP
C
. The
VIO
VST
used
Data Sheet
17/51
V20
VST
VCC buck
discharges and the voltage V
converter
VCC
VCC
(18)
(18)
)
C
3
Is generated by a linear voltage regulator out of the V
It is the supply for additional circuits and has the low-
est priority. V20 is the first one drops down, to prevent
a dropping down of VCC with the consequence of a mi-
crocontroller reset. If a continuous overload is applied a
pulsing V20 is possible.
2
Is generated by a step down DC/DC converter and could
supply a microcontroller with its peripheral. The output
voltage is selectable 5V or 3.3V. The supply could deliv-
er up to 30mA at 5V and 50mA at 3.3V. Before it drops
down V20 is switched of. If a continues overload condi-
tion is active V
nal flags a overload condition before VCC drops down.
1
Supplies the IC and is the last one which drops down.
Please refer the Application Note for more details.
I
VCC
VCC
rd
nd
st
: V33I
: V20
V
: VCC
VCC
Option 1: V
Option 2: V
Switch A:
Switch to 0:
Switch to 1:
Switch to 2:
Switch B:
Switch to 1:
(V
Switch to 2:
Switch C:
Open: When V
Close: When V
VST
VIO
VIO
VCC
supplied by V
supplied by external
=5V and PFCTRL (0x20e) Bit 7 is set))
drops below V
V
V
V
V
VST
VST
VST
VST
< V
> V
> V
> V
Only after PON until end of soft-start
(V
(V
Otherwise
VST
Otherwise
VST
VIO
VCC
(V
V20,off,abs,typ
BUSP,mean
V20,on,abs,typ
VBUSP,mean
is below V
VCC
VIO
is above either V
is in valid range >~3.1 … <~3.4V) and (V
=5V and PFCTRL (0x20e) Bit 7 is set))
VST
is in valid range >~3.1 … <~3.4V) and (V
- 6 V
- 5 V
drops down.
= V
= V
V20
VST,SAVE,LH,abs,typ
VST,SAVE,HL,typ
,off,abs or V
VST,SAVE,HL
QM-No.: 25DS0046E.01
V20,on,abs
+1 V=14V+1V=15V
+1 V=15V+1V=16V
and V
V20,off,rel
and the SAFE sig-
V20,on,rel
E981.03
VCC
VCC
is 3.3V or
is 3.3V or
ST
.