Specifications

Cinterion
®
ELS81-US Hardware Interface Description
Contents
107
 els81-us_hid_v01.004 2017-09-27
Confidential / Preliminary
Page 3 of 107
Contents
1 Introduction ................................................................................................................. 9
1.1 Key Features at a Glance .................................................................................. 9
1.2 ELS81-US System Overview ........................................................................... 12
1.3 Circuit Concept ................................................................................................ 13
2 Interface Characteristics .......................................................................................... 15
2.1 Application Interface ........................................................................................ 15
2.1.1 Pad Assignment.................................................................................. 15
2.1.2 Signal Properties................................................................................. 17
2.1.2.1 Absolute Maximum Ratings ................................................ 23
2.1.3 USB Interface...................................................................................... 24
2.1.3.1 Reducing Power Consumption............................................ 25
2.1.4 Serial Interface ASC0 ......................................................................... 26
2.1.5 Serial Interface ASC1 ......................................................................... 28
2.1.6 UICC/SIM/USIM Interface................................................................... 30
2.1.6.1 Enhanced ESD Protection for SIM Interface....................... 32
2.1.7 RTC Backup....................................................................................... 33
2.1.8 GPIO Interface .................................................................................... 34
2.1.9 I
2
C Interface ........................................................................................ 36
2.1.10 SPI Interface ....................................................................................... 38
2.1.11 PWM Interfaces .................................................................................. 39
2.1.12 Pulse Counter ..................................................................................... 39
2.1.13 Control Signals.................................................................................... 39
2.1.13.1 Status LED .......................................................................... 39
2.1.13.2 Power Indication Circuit ...................................................... 40
2.1.13.3 Host Wakeup....................................................................... 40
2.1.13.4 Fast Shutdown .................................................................... 41
2.2 RF Antenna Interface....................................................................................... 42
2.2.1 Antenna Interface Specifications ........................................................ 42
2.2.2 Antenna Installation ............................................................................ 44
2.2.3 RF Line Routing Design...................................................................... 45
2.2.3.1 Line Arrangement Examples ............................................... 45
2.2.3.2 Routing Example................................................................. 50
2.3 Sample Application .......................................................................................... 51
2.3.1 Sample Level Conversion Circuit........................................................ 53
3 Operating Characteristics ........................................................................................54
3.1 Operating Modes ............................................................................................. 54
3.2 Power Up/Power Down Scenarios................................................................... 55
3.2.1 Turn on ELS81-US.............................................................................. 55
3.2.1.1 Connecting ELS81-US BATT+ Lines .................................. 55
3.2.1.2 Switch on ELS81-US Using ON Signal ............................... 57
3.2.1.3 Automatic Power On ........................................................... 58
3.2.2 Restart ELS81-US .............................................................................. 59