ACS ACR40T User manual

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Reference Manual V1.01
ACR40T
USB SIM-sized Smart Card Reader

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Revision History
Date
Revision Description
Version Number
2022-11-14
●Initial version
1.00
2023-07-26
●Document formatting
1.01

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Table of Contents
1.0. Introduction .............................................................................................................5
1.1. Reference Documents...........................................................................................................5
1.2. Symbols and Abbreviations ...................................................................................................5
2.0. Smart Card Support ................................................................................................6
2.1. MCU Cards............................................................................................................................6
2.2. Memory-based Smart Cards..................................................................................................6
3.0. System Block Diagram............................................................................................7
4.0. USB Interface...........................................................................................................8
4.1. Communication Parameters..................................................................................................8
4.2. Endpoints...............................................................................................................................8
5.0. User Interface ..........................................................................................................9
5.1. Status LED.............................................................................................................................9
5.2. Configurable push button (ACR40T-A7/8 only).....................................................................9
6.0. Smart Card Interface.............................................................................................10
6.1. Smart Card Power Supply VCC (C1) ..................................................................................10
6.2. Programming Voltage VPP (C6)..........................................................................................10
6.3. Card Type Selection ............................................................................................................10
6.4. Interface for Microcontroller-based Cards ...........................................................................10
7.0. USB Communication Protocol..............................................................................11
7.1. CCID Bulk-OUT Messages..................................................................................................12
7.1.1. PC_to_RDR_IccPowerOn...........................................................................................12
7.1.2. PC_to_RDR_IccPowerOff...........................................................................................12
7.1.3. PC_to_RDR_GetSlotStatus........................................................................................13
7.1.4. PC_to_RDR_XfrBlock.................................................................................................13
7.1.5. PC_to_RDR_GetParameters......................................................................................14
7.1.6. PC_to_RDR_ResetParameters ..................................................................................14
7.1.7. PC_to_RDR_SetParameters ......................................................................................15
7.2. CCID Bulk-IN Messages......................................................................................................17
7.2.1. RDR_to_PC_DataBlock..............................................................................................17
7.2.2. RDR_to_PC_SlotStatus..............................................................................................18
7.2.3. RDR_to_PC_Parameters............................................................................................18
8.0. Host Programming API .........................................................................................20
8.1. Peripherals Control..............................................................................................................20
8.1.1. Get Firmware Version Command ...............................................................................20
8.1.2. Get Card Voltage Selection Sequence.......................................................................20
8.1.3. Set Card Voltage Selection.........................................................................................21
8.1.4. Write Customer Data...................................................................................................22
8.1.5. Read Customer Data ..................................................................................................22
8.1.6. Change Customer PIN................................................................................................22
8.1.7. Select operation mode for push button.......................................................................22
8.1.8. Read the Status of push button ..................................................................................23
8.2. Memory Card Command Set...............................................................................................24
8.2.1. Memory Card –1, 2, 4, 8, and 16 kilobit I2C Card .....................................................24
8.2.2. Memory Card –32, 64, 128, 256, 512, and 1024 kilobit I2C Card .............................27
8.2.3. Memory Card –ATMEL AT88SC153..........................................................................30
8.2.4. Memory Card –ATMEL AT88C1608..........................................................................33
8.2.5. Memory Card –SLE4418/SLE4428/SLE5518/SLE5528............................................37
8.2.6. Memory Card –SLE4432/SLE4442/SLE5532/SLE5542............................................42

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List of Figures
Figure 1 : ACR40T Architecture.............................................................................................................7
List of Tables
Table 1 : Symbols and Abbreviations.....................................................................................................5
Table 2 : USB Interface Wiring...............................................................................................................8
Table 3 : Status LED...............................................................................................................................9
Table 4 : Operation mode of button........................................................................................................9

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1.0.Introduction
The ACR40T USB Sim-sized smart card reader serves as an intermediary for communication between
a computer and a smart card. Different smart cards have varying communication protocols and
commands, making direct communication with a computer challenging. However, the ACR40T USB
Sim-sized smart card reader offers a standardized interface for a broad range of smart cards, thus
freeing software developers from the technical complexities of smart card operations. By handling the
card's specifics, the ACR40T USB Sim-sized smart card reader allows programmers to focus on
implementing the smart card system's functionality without worrying about the underlying technical
details.
1.1. Reference Documents
The following related documents are available from www.usb.org
•Universal Serial Bus Specification 2.0 (also referred to as the USB specification), April 27, 2000
•Universal Serial Bus Common Class Specification 1.0, December 16, 1997
•Universal Serial Bus Device Class: Smart Card CCID Specification for Integrated Circuit(s)
Cards Interface Devices, Revision 1.1, April 22, 2005
The following related documents can be ordered through www.ansi.org
•ISO/IEC 7816-1; Identification Cards –Integrated circuit(s) cards with contacts - Part 1:
Physical Characteristics
•ISO/IEC 7816-2; Identification Cards –Integrated circuit(s) cards with contacts - Part 2:
Dimensions and Locations of the contacts
•ISO/IEC 7816-3; Identification Cards –Integrated circuit(s) cards with contacts - Part 3:
Electronic signals and transmission protocols
1.2. Symbols and Abbreviations
Abbreviation
Description
ATR
Answer-To-Reset
CCID
Chip/Smart Card Interface Device
ICC
Integrated Circuit Cards
IFSC
Information Field Sized for ICC for protocol T=1
IFSD
Information Field Sized for CCID for protocol T=1
NAD
Node Address
PPS
Protocol and Parameters Selection
RFU
Reserved for future use1
TPDU
Transport Protocol Data Unit
USB
Universal Serial Bus
Table 1: Symbols and Abbreviations
1
Must be set to zero unless stated differently.

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2.0.Smart Card Support
2.1. MCU Cards
ACR40T is a PC/SC-compliant smart card reader that supports ISO 7816 Class A, B, and C (5 V, 3 V,
and 1.8 V) smart cards. It also works with MCU cards following either the T=0 and T=1 protocol.
The card ATR indicates the specific operation mode (TA2 present; bit 5 of TA2 must be 0) and when
that particular mode is not supported by the ACR40T, it will reset the card to negotiable mode. If the
card cannot be set to negotiable mode, the reader will then reject the card.
When the card ATR indicates the negotiable mode (TA2 not present) and communication parameters
other than the default parameters, the ACR40T will execute the PPS and try to use the communication
parameters that the card suggested in its ATR. If the card does not accept the PPS, the reader will use
the default parameters (F=372, D=1).
For the meaning of the aforementioned parameters, please refer to ISO 7816-3.
2.2. Memory-based Smart Cards
ACR40T works with several memory-based smart cards such as:
•Cards following the I2C bus protocol (free memory cards) with maximum 128 bytes page with
capability, including:
oAtmel®: AT24C01/02/04/08/16/32/64/128/256/512/1024
•Cards with secure memory IC with password and authentication, including:
oAtmel®: AT88SC153 and AT88SC1608
•Cards with intelligent 1 KB EEPROM with write-protect function, including:
oInfineon®: SLE4418, SLE4428, SLE5518 and SLE5528
•Cards with intelligent 256 bytes EEPROM with write-protect function, including:
oInfineon®: SLE4432, SLE4442, SLE5532 and SLE5542

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3.0.System Block Diagram
Figure 1: ACR40T Architecture
*Button is only available in model ACR40T-A7/8
ACR40T
MCU
LEDs
Button*
USB
Computer
SIM-sized
Card

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4.0.USB Interface
4.1. Communication Parameters
ACR40T is connected to a computer through USB as specified in the USB Specification 2.0. ACR40T
is working in full speed mode, i.e. 12 Mbps.
Pin
Signal
Function
1
VBUS
+5 V power supply for the reader
2
D-
Differential signal transmits data between ACR40T and computer
3
D+
Differential signal transmits data between ACR40T and computer
4
GND
Reference voltage level for power supply
Table 2: USB Interface Wiring
4.2. Endpoints
ACR40T uses the following endpoints to communicate with the host computer:
Control Endpoint
For setup and control purpose
Bulk OUT
For command to be sent from host to ACR40T
(data packet size is 64 bytes)
Bulk IN
For response to be sent from ACR40T to host
(data packet size is 64 bytes)
Interrupt IN
For card status message to be sent from ACR40T to host
(data packet size is 8 bytes)

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5.0.User Interface
5.1. Status LED
ACR40T has three different LED behaviors to show various operation status, where:
•Green LED - Card and reader status under USB mode
Table 3: Status LED
5.2. Configurable push button (ACR40T-A7/8 only)
ACR40T has a push button which can operate in various modes, where:
Table 4: Operation mode of button
Color
LED Activity
Status
Green
Slow flash
(2 seconds/flash)
No card operation and the reader is waiting for PC instructions
Fast flash
Data transferring between the reader and PC
On
Card is connected and powered on
Mode
Description
0
Read button’s status by sending escape command
1
Emulate card removal event
2
Disable button feature

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6.0.Smart Card Interface
The interface between the ACR40T and the inserted smart card follows the specification of ISO 7816-
3 with certain restrictions or enhancements to increase the practical functionality of ACR40T.
6.1. Smart Card Power Supply VCC (C1)
The current consumption of the inserted card must not higher than 50 mA.
6.2. Programming Voltage VPP (C6)
According to ISO 7816-3, the smart card contact C6 (VPP) supplies the programming voltage to the
smart card. Since all common smart cards in the market are EEPROM-based and do not require the
provision of an external programming voltage, the contact C6 (VPP) has not been implemented as a
normal control signal in the ACR40T.
6.3. Card Type Selection
The controlling computer must always select the card type through the proper command sent to the
ACR40T prior to activating the inserted card. This includes both the memory cards and MCU-based
cards.
For MCU-based cards, the reader allows to select the preferred protocol, T=0 or T=1. However, this
selection is only accepted and carried out by the reader through the PPS when the card inserted in the
reader supports both protocol types. Whenever an MCU-based card supports only one protocol type,
T=0 or T=1, the reader automatically uses that protocol type, regardless of the protocol type selected
by the application.
6.4. Interface for Microcontroller-based Cards
For microcontroller-based smart cards, only the contacts C1 (VCC), C2 (RST), C3 (CLK), C5 (GND)
and C7 (I/O) are used. A frequency of 4.8 MHz is applied to the CLK signal (C3).