Rohm LAPIS ML7436N, Hardware Design Manual

Page: 6 / 29

ML7436N LSI Hardware Design Manual
FEXL7436NDG-01
vi
Table of Contents
NOTES
........................................................................................................................................................................... ii
Introduction
................................................................................................................................................................... iv
Notation
........................................................................................................................................................................... v
Table of Contents ......................................................................................................................................................... vi
1. Bypass capacitors
...................................................................................................................................................7
2.
Crystal Oscillator circuit .......................................................................................................................................7
2.1.
Circuit component values for crystal oscillator circuit ................................................................................8
2.2.
Notes on the crystal oscillator circuit configuration ....................................................................................8
3. TCXO circuit
............................................................................................................................................................9
4. Debugger interface
............................................................................................................................................... 10
5. Internal ADC
......................................................................................................................................................... 10
6. Hard Reset
............................................................................................................................................................ 11
7. RF matching circuit
............................................................................................................................................... 11
7.1. SubGHz reception circuit matching development procedure
....................................................................... 13
7.1.1. Connection of coupling capacitor
.......................................................................................................... 14
7.1.2. Adjustment of LNA input impedance real part to 50Ω
........................................................................... 15
7.1.3. Adjustment of LNA input impedance imaginary part to 0Ω
................................................................... 16
7.1.4. Connection to antenna
.......................................................................................................................... 17
7.1.5. Reception matching value
..................................................................................................................... 17
7.2. SubGHz transmission circuit matching development procedure
.................................................................. 18
7.3. 2.4GHz RF matching development procedure
............................................................................................. 19
7.3.1. Addition of higher harmonics trap filter
................................................................................................. 20
7.3.2. Addition of impedance conversion circuit (if necessary)
....................................................................... 20
7.3.3. Connection to reception line
................................................................................................................. 21
7.3.4. Matching circuit value
........................................................................................................................... 22
8. Parts selection
...................................................................................................................................................... 23
8.1. Antenna
........................................................................................................................................................ 23
8.2. Inductors
....................................................................................................................................................... 23
8.3. Capacitors
..................................................................................................................................................... 23
8.4. Resisters
....................................................................................................................................................... 23
9. Notes on board artworks
...................................................................................................................................... 24
9.1. GND
.............................................................................................................................................................. 24
9.2. Switching regulator
....................................................................................................................................... 25
10. Schematic example
.......................................................................................................................................... 26
11. Bill of materials
................................................................................................................................................. 28
Revision history
........................................................................................................................................................... 29