E981.03A38HB ELMOS Semiconductor, E981.03A38HB Datasheet - Page 18

• 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

5.9 Clock System
The main clock is generated by an internal RC oscilla-
tor. An external clock reference / crystal can be used to
achieve a system clock accuracy of approx 0.05%.
Two different synchronization clocks are useable:
1) Crystal at f
•
•
2) Clock reference at f
•
6 Mode Depending Device Functions
1) Trigger mode only available from Normal Mode
2) Alarm mode not available in Analog Mode see chapter
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
default configuration
foot point capacitors are incl
the crystal oscillator should be switched off
- EXT_Q to 1 in
e.g. from host
f
XTAL,sync
processor
Q
CLK source
= 7.3728 MHz
XTAL,sync
CLK_CTRL
= 126.562 Hz
XTAL
V
33I
Hard
reset
not ok
Save
crystal
Register
condition
Reset
Q
1
V
EXTAL
33I
XTAL
ok
Voltage
VST ok
Figure 7. Clock Generation
Voltage
Figure 8. Device Modes
not ok
VST
E981.03
start
Soft
C
Receive Trigger
C
Trigger
EXTAL
XTAL
Telegram
6.5 Analog Mode
Data Sheet
1)
18/51
No condition
Communication
Soft start
OSC
finished
The sync - signal source could be a crystal oscilla-
tor (OSCQ) or an external VIO related digital clock on
XTAL(remark: absolute maximum rating “V”). The IC au-
tomatically detects the used mode and selects the cor-
rect internal signal path.
In Analog Mode no crystal and no external clock are re-
quired. To increase the robustness to EMI the input XTAL
shall be connected to GND if not used.
Mode
Q
telegram transmition
End of alarm
OSC
divider
D
Q
RC
Met alarm
condition
Alarm
1
0
2)
CLK
sync
PLL
in
QM-No.: 25DS0046E.01
CLK
CLK
CLK
ACLK
CLK
SPI
KNX
Memory
UART
E981.03