Cavli Wireless C31SS User manual

Cavli C31SS
LTE CAT M1/NB-IoT
Smart Module
Hardware Manual
Release Version 1.4
Copyright © 2019 by Cavli Wireless Inc.
All rights reserved. All document materials, including, without limitation, the logos, design, text, graphics, other files and the selection and
arrangement are copyrighted as otherwise noted on the linked page. No part of this publication may be reproduced, distributed, or transmitted
in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written
permission of the publisher, except in the case of brief quotations embodied in critical reviews and certain other noncommercial uses permitted
by copyright law. For permission requests, are allowed only for company with registered customer ID within Cavli Wireless. Write to
[email protected] for registering the company.
Cavli Wireless Inc.
177 Park Avenue
San Jose, California, USA 95113
www.cavliwireless.com
Designed in USA

Update records
Version
Date
Author
Description
V1.01
2019/7/5
Initial Document

Contents
Chapter 1. Introduction 10
Chapter 2. Review of modules 10
2.1 A brief introduction to the module 10
2.2 Main performance 11
2.3 Module function block diagram 12
2.4 Module working mode 13
Chapter 3. Interface application description 13
3.1 A summary of this chapter 13
3.2 Module interface 14
3.2.1 C31SS pins distribution diagram 14
3.2.2 Module pins description 15
3.3 Power interface 20
3.4 VDD_EXT 1V8 voltage output 20
3.5 Switchgear reset mode 21
3.5.1 Turn on the module 21
3.5.2 Starting time sequence 21
3.5.3 Power enable control 22
3.6 Signals related to Low Power Mode 23
3.6.1 Signals 23
3.7 UART interface 24
3.7.1 Serial port application circuit 25
3.8 Wakeup Interface 26

3.9 USIM interface 26
3.9.1 USIM card reference circuit 27
3.9.2 SIM_DECT hot plug reference design 28
3.10 SPI interface 29
3.11 Network indicator interface 29
3.12 General GPIO interface 30
Chapter 4. RF overall technical index 30
4.1 Summary 30
4.2 Main antenna and Auxiliary Antenna 31
4.3 Route guidance of radio frequency signal line 32
4.4 Radiofrequency connector 33
4.5 Working frequency 34
4.6 RF Output power 35
4.7 RF Sensitivity 35
Chapter 5. Electrical characteristics of interface 36
5.1 Summary 36
5.2 Module IO level 36
5.3 Electrostatic characteristics 37
5.4 Electrical maximum rating for C100SS/C10SS 38
5.5 Auxiliary ADC Specification 38
Chapter 6 Reference Circuit 40
Chapter 7. Structure and mechanical properties 41
7.1 Summary 41
7.2 Appearance 41

Chapter 8. Production and packaging 43
8.1 Summary 43
8.2 Module packaging and storage 44
8.3 Acronyms 44
Graph Contents
Chapter 1. Introduction 10
Chapter 2. Review of modules 10
2.1 A brief introduction to the module 10
2.2 Main performance 11
2.3 Module function block diagram 12
2.4 Module working mode 13
Chapter 3. Interface application description 13
3.1 A summary of this chapter 13
3.2 Module interface 14
3.2.1 C31SS pins distribution diagram 14
3.2.2 Module pins description 15
3.3 Power interface 20
3.4 VDD_EXT 1V8 voltage output 20
3.5 Switchgear reset mode 21
3.5.1 Turn on the module 21
3.5.2 Starting time sequence 21
3.5.3 Power enable control 22
3.6 Signals related to Low Power Mode 23

3.6.1 Signals 23
3.7 UART interface 24
3.7.1 Serial port application circuit 25
3.8 Wakeup Interface 26
3.9 USIM interface 26
3.9.1 USIM card reference circuit 27
3.9.2 SIM_DECT hot plug reference design 28
3.10 SPI interface 29
3.11 Network indicator interface 29
3.12 General GPIO interface 30
Chapter 4. RF overall technical index 30
4.1 Summary 30
4.2 Main antenna and Auxiliary Antenna 31
4.3 Route guidance of radio frequency signal line 32
4.4 Radiofrequency connector 33
4.5 Working frequency 34
4.6 RF Output power 35
4.7 RF Sensitivity 35
Chapter 5. Electrical characteristics of interface 36
5.1 Summary 36
5.2 Module IO level 36
5.3 Electrostatic characteristics 37
5.4 Electrical maximum rating for C100SS/C10SS 38
5.5 Auxiliary ADC Specification 38

Chapter 6 Reference Circuit 40
Chapter 7. Structure and mechanical properties 41
7.1 Summary 41
7.2 Appearance 41
Chapter 8. Production and packaging 43
8.1 Summary 43
8.2 Module packaging and storage 44
8.3 Acronyms 44
Table Contents
Chapter 1. Introduction 10
Chapter 2. Review of modules 10
2.1 A brief introduction to the module 10
2.2 Main performance 11
2.3 Module function block diagram 12
2.4 Module working mode 13
Chapter 3. Interface application description 13
3.1 A summary of this chapter 13
3.2 Module interface 14
3.2.1 C31SS pins distribution diagram 14
3.2.2 Module pins description 15

3.3 Power interface 20
3.4 VDD_EXT 1V8 voltage output 20
3.5 Switchgear reset mode 21
3.5.1 Turn on the module 21
3.5.2 Starting time sequence 21
3.5.3 Power enable control 22
3.6 Signals related to Low Power Mode 23
3.6.1 Signals 23
3.7 UART interface 24
3.7.1 Serial port application circuit 25
3.8 Wakeup Interface 26
3.9 USIM interface 26
3.9.1 USIM card reference circuit 27
3.9.2 SIM_DECT hot plug reference design 28
3.10 SPI interface 29
3.11 Network indicator interface 29
3.12 General GPIO interface 30
Chapter 4. RF overall technical index 30
4.1 Summary 30
4.2 Main antenna and Auxiliary Antenna 31
4.3 Route guidance of radio frequency signal line 32
4.4 Radiofrequency connector 33
4.5 Working frequency 34
4.6 RF Output power 35

4.7 RF Sensitivity 35
Chapter 5. Electrical characteristics of interface 36
5.1 Summary 36
5.2 Module IO level 36
5.3 Electrostatic characteristics 37
5.4 Electrical maximum rating for C100SS/C10SS 38
5.5 Auxiliary ADC Specification 38
Chapter 6 Reference Circuit 40
Chapter 7. Structure and mechanical properties 41
7.1 Summary 41
7.2 Appearance 41
Chapter 8. Production and packaging 43
8.1 Summary 43
8.2 Module packaging and storage 44
8.3 Acronyms 44

Cavli Wireless C31SS Hardware Manual
10
Chapter 1. Introduction
This document is a wireless solution product C31SS module hardware interface manual,
which is designed to describe the hardware composition and functional features of the
module, the definition and usage of the application interface, the electrical performance
and mechanical properties. Combined with this document and other application
documents, users can quickly use the module to design wireless products.
Chapter 2. Review of modules
2.1 A brief introduction to the module
Cavli C31SS module includes Cat-M1/NBIoT baseband, a complete dual band RF front end,
memory and required circuitry to meet 3GPP E-UTRA (Long Term Evolution - LTE, Release
13 set of specifications) and Verizon Wireless LTE Cat-M1 UE specifications. It is
encapsulated for LGA with 138 pins, and the structure size of the module is
21.35mm*20.25mm*1.79mm. Support the following frequency bands:
• Supported LTE Bands: B1/B2/B3/B4/B12/B13/B18/B19/B28/B66/B71
This module uses low power technology. The C31SS module can be used in the following
applications:
●Vehicle equipment
●Smart city (intelligent parking, water / gas meter, street lamp, smoke alarm,
garbage bin, etc.)
●Intelligent medical treatment
●Industrial and agricultural intelligent monitoring (machine alarm, gas detection,
irrigation, soil pH value, etc.)
●Smart home

Cavli Wireless C31SS Hardware Manual
11
"*" indicates that it is being developed.
2.2 Main performance
Table 2-1 key features
Characteristic
Describe
Physical
characteristics
21.35mm*20.25mm*1.79mm
Working voltage
3.15V - 5.5V Typical voltage 3.3V
General interfaces
• JTAG
• I2C(Recerved)
• SPI
• GPIO
• USIM
• UART(x3, including one reserved)
Supported bands
Band1/2/3/4/12/13/18/19/28/66/71
Data transmission
characteristics
NB-IOT: 62.5 Kbps(DL),27.2 Kbps(UP)
LTEM1: 300 Kbps(DL),100 Kbps(UP)
Peak data rate
NB-IOT:<100Kbps, LTEM1:<300Kbps
Latency
NB-IOT:1.5-10Sec, LTEM1: 50-100ms
Antenna interface
50 Ω interface of the main antenna
Firmware update
Serial port upgrade
Temperature range
• RF compliant -30°C to +60°C (ambient)
• Operational: -40°C to +85°C (board)
AT command
Support standard AT command set (Hayes 3GPP TS
27.007
and 27.005)

Cavli Wireless C31SS Hardware Manual
12
2.3 Module function block diagram
Cavli C31SS module includes Cat-M1 baseband, a complete dual band RF front end,
memory and required circuitry to meet 3GPP E-UTRA (Long Term Evolution - LTE, Release
13 set of specifications) and Verizon Wireless LTE Cat-M1 UE specifications.
The term C31SS module refer to the hardware and the associated embedded software.
The architecture block diagram of the C31SS is presented on Figure 1-1
Figure 2-1 Functional block diagram of C31SS module

Cavli Wireless C31SS Hardware Manual
13
2.4 Module working mode
Table 2-2 work mode
Working mode
Describe
Turn off the machine
In the case of shutdown, the module can't work
Flight Mode
The module closes the module RF circuit, unable to interact
with the network.
Dormancy
The module closes most functions, and it will synchronize
with the network.
Free
Turn on the machine and register the network successfully,
in the idle state
Data transmission
The module is in working state and has data interaction with
the network.
Chapter 3. Interface application description
3.1 A summary of this chapter
The C31SS module has 138 pins, including the following unit interface functions. The
functions of each unit interface will be explained in detail in the following chapters.
✧Power supply interface
✧USIM interface
✧UART interface
✧Network status indicator interface
✧SPI interface
✧RF antenna interface
✧I2C interface

Cavli Wireless C31SS Hardware Manual
14
3.2 Module interface
3.2.1 C31SS pins distribution diagram
C31SS pins are assigned as follows：
Figure 3-1 C31SS pins distribution diagram (BOTTOM VIEW)
1The IO port electric level of the module is 1.8V (SIM card port electric level
supports 1.8V and 3.0V).
2The module defines that the RESERVED pins are suspended and cannot be
used.

Cavli Wireless C31SS Hardware Manual
15
3.2.2 Module pins description
The definition of the module interface pins is described as follows:
Table 3-1 pins parameter abbreviations
Sign indicator
Describe
IO
Input or output
PI
Power input
PO
Power output
AI
Analog input
AO
Analog output
DI
Digital input
DO
Digital output
Table 3-2 interface definition
Pins
Pins Name
Alternative
Function
IO
Remarks
2
NETWORK_LED
GPIO_3,
SPI_CS_N_
2
Out
3
VDD_EXT (1V8)
Out
Reference
voltage for IOs.
Note: it can be
used to provide
power small
devices
(50 mA max
usage)
4
USB_EXT_VBUS_
VLD
WAKE_2
In
5
FFF_FFH
GPIO_18
In
- Pull-up for a system
boot in FFF mode.
- Pull-down for a
system boot in FFH
mode.
6
ACTIVITY_LED
GPIO_2
Out

Cavli Wireless C31SS Hardware Manual
16
7
MODULE_ON_IN
D
GPIO_19
Out
Module “ON”
Indicator.
8
HWID1
GPIO_27
In
This signal shall be
pull-up.
9
HSIC_DATA
In/Out
10
HWID2
GPIO_28
In
This signal shall be
pull-up.
11
HSIC_STROBE
Out
12
SIM_RSTN
Out
13
USB_D+
In/Out
14
SIM_CLK
Out
15
USB_D-
In/Out
16
SIM_DETECT
In
SIM_DETECT = 1
signals that a card
is present.
SIM_DETECT = 0
signals that no
card is present.
17
SIM_IO
In/Out
18
SIM_VCC
Out
19
SDIO_HOST_D2
GPIO_6
In / Out
21
SDIO_HOST_CLK
GPIO_9
Out
23
SDIO_HOST_CM
D
GPIO_8
In/Out
25
SDIO_HOST_D1
GPIO_5,
WAKE_3
In / Out
27
SDIO_HOST_D0
GPO_4
In / Out
29
SDIO_HOST_D3
GPO_7
In / Out
35
PCM_RXD
GPIO_10
In
36
PCM_CLK
GPIO_1
In
37
PCM_FS
GPIO_9
In/Out
38
PCM_TXD
GPIO_8
Out
39
RFDATA_12
Out

Cavli Wireless C31SS Hardware Manual
17
40
RFDATA_18
Out
41
RFDATA_19
Out
44
DNC
Do Not
Connect,
reserved
47
RESET_N
In
48
JTAG_TDO
Out
49
JTAG_TRSTN
In
50
JTAG_TMS
In
51
JTAG_TDI
In
52
JTAG_TCK
In
54
ANT0
In / Out
Main antenna
56
UART0_SOUT
GPIO_35
Out
57
AUX_ADC
In
58
UART0_SIN
GPIO_34
In
59
SPI_SDI
GPIO_44
Out
60
SPI_CS_N_1
GPIO_47
Out
61
SPI_CLK
GPIO_43
Out
67
SPI_SDO
GPIO_45
In
75
UART2_CTS
GPIO_6
In
76
UART2_RTS
GPIO_7
Out
77
UART2_SIN
GPIO_4
In
78
UART3_SIN
GPIO_14
In
79
UART2_SOUT
GPIO_5
Out
80
UART3_SOUT
GPIO_15
Out
81
UART3_RTS
GPIO_17
Out
82
SQN3221_GPIO_
38
In / Out

Cavli Wireless C31SS Hardware Manual
18
83
UART3_CTS
GPIO_16
In
84
SQN3221_GPIO_
41
In / Out
85
SQN3221_GPIO_
39
In / Out
88
SQN3221_GPIO_
24
In / Out
89
SQN3221_GPIO_
25
In / Out
90
SQN3221_GPIO_
40
In / Out
91
SQN3221_GPIO_
26
In / Out
92
SQN3221_GPIO_
20
In / Out
93
SQN3221_GPIO_
23
In / Out
94
SQN3221_GPIO_
22
In / Out
95
SQN3221_GPIO_
21
In / Out
96
WAKE_1
GPIO_3
In
97
VCC1_PA
In
98
VCC2_PA
In
99
VCC2_PA
In
100
DNC
Do Not
Connect,
reserved
101
DNC
Do Not
Connect,
reserved
102
DNC
Do Not
Connect,
reserved
103
DNC
Do Not
Connect,
reserved
104
WAKE_0
In
See details in
Section 4.5 Low
Power Mode on

Cavli Wireless C31SS Hardware Manual
19
page
35.
105
SAR_DETECT
GPIO_42
In / Out
106
MODULE_PWR_
EN
In
See IO
Characteristics
for
VDD_PWR_EN
107
VBAT1
In
108
VBAT1
In
1,20
22,24
26,28
30,31
32,33
34,42
43,45
46,53
55,62
63,64
65,66
68,69
70,71
72,73
74,86
87
GND
All GND
pads shall
be
connected
to the same
copper.
T1,T2,
T3,T4,
T5,T6,
T7,T8,
T9,T10
,T11,T
12,T13
,T14,T
15,T16
,T17,T
18,T19
,T20,T
21,T22
,T23,T
24,T25
,T26,T
27,T28
,T29,T
30
GND

Cavli Wireless C31SS Hardware Manual
20
3.3 Power interface
The C31SS module power interface consists of two parts:
✧VBAT1, VBAT2, VCC_APT, VCC1_PA, VCC2_PA is the power supply for the module.
✧The VDD_EXT is an internal LDO 1.8V output power for external use.
The voltage input range of the power supply VBAT is 3.15V~4.5V. The module
supplies the internal RF and baseband circuits through the two pins of VBAT. On the
premise of ensuring that the VBAT power supply is sufficient, one 100uF tantalum
capacitors with low equivalent series resistance can be parallel in parallel to the power
input, and then parallel connect 10pF, 33pF, 0.1uF, 1uF ceramic capacitors. The PCB line
of VBAT is as short and coarse as possible.
VBAT
+100uF 1uF 100nF 10pF 33pF
Figure 3-2 VBAT power supply power supply
1In order to prevent the module from being damaged by surge and
overvoltage, it is suggested that a 5.1V/500mW Zener diode be connected in parallel with
the VBAT pin of the module.
2It is suggested that 3 ceramic capacitors (33pF, 10pF, 100nF) be added to
the VBAT pin and placed near the VBAT pin.
3.4 VDD_EXT 1V8 voltage output
After the C31SS module is opened normally, the twenty-sixth pins will output voltage
1.8V, the current load is maximum 50mA, and the external master control can read the