ST ST7GEME4 User Manual

ST7GEME4

Full-speed USB MCU with smartcard firmware and EMV/non-EMV interface

Features

■Clock, reset and supply management

–Low voltage reset

–Halt power saving mode

–PLL for generating 48 MHz USB clock using a 4 MHz crystal

■USB (Universal Serial Bus) interface

–USB 2.0 compliant

–CCID V1.0

–Full speed, hubless

–Bus-powered, low consumption

■Serial RS232 interface

–Transmission rate: 9.6 Kbps to 115 Kbps

–Format: 8-bit, no parity

–Auto baud rate

–CCID V1.0 on serial TTL link

■ISO 7816-3 UART interface

–4 Mhz clock generation

–Synchronous/Asynchronous protocols (T=0, T=1)

–Automatic retry on parity error

–Programmable baud rate from 372 to 11.625 clock pulses (D=32/F=372)

–Card insertion/removal detection

■Smartcard power supply

–Selectable card VCC: 1.8 V, 3 V, and 5 V

Table 1. Device summary

24

1

VFQFPN24 SO24(9U)

–Internal Step-up converter for 5V supplied Smartcards (with a current of up to 55mA) using only two external components.

–Programmable smartcard internal voltage regulator (1.8 to 3.0 V) with current overload protection and 4 kV ESD protection (Human Body Model) for all smartcard interface I/Os

■Development tools

–Application note on PCB recommendations and component bill of materials

–Full hardware/software kit for performance evaluation

Description

The ST7GEME4 is an 8-bit microcontroller dedicated to smartcard reading applications. It has been developed to be the core of smartcard readers communicating through a serial or USB link. It is pre-programmed using Gemplus software, and offers a single integrated circuit solution with very few external components.

Features		Order codes
	ST7GEME4M1		ST7GEME4U1
Program memory		16K ROM
User RAM + USB data buffer (bytes)		512 + 256
Peripherals	USB Full-Speed (7 Ep), TBU, Watchdog timer, ISO 7816-3 Interface
Operating Supply		4.0 to 5.5 V
Package	SO24		VFQFPN24
CPU Frequency		4 or 8 MHz
Operating temperature		0 to +70 °C
September 2007	Rev 2.0	1/28
			www.st.com

Contents	ST7GEME4

Contents

1	Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 5
2	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		7
3	ST7GEME4 implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10
	3.1	Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	3.2	Smartcard interface features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	3.3	EMV versus PC/SC-ISO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
4	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		13

4.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.3 Supply and reset characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.4 Clock and timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4.4.1 General timings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.4.2 Crystal resonator oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.5 Memory characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.6 Smartcard supply supervisor electrical characteristics . . . . . . . . . . . . . . 19 4.7 EMC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4.7.1 Functional EMS (electromagnetic susceptibility) . . . . . . . . . . . . . . . . . . 21 4.7.2 Electromagnetic interference (EMI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.7.3 Absolute maximum ratings (electrical sensitivity) . . . . . . . . . . . . . . . . . 23

4.8 Communication interface characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 24

5	Package characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25
	5.1 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25
6	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	27

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ST7GEME4	List of tables

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3. Technical features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 5. Thermal characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 6. General operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 7. Current injection on I/O port and control pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 8. Current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 9. I/O port pins characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 10. LED pins characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 11. Low voltage detector and supervisor characteristics (LVDS) . . . . . . . . . . . . . . . . . . . . . . . 16 Table 12. General timings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Table 13. External clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 14. Crystal resonator oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 15. Typical crystal resonator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 16. Recommended values for 4 MHz crystal resonator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 17. RAM and hardware registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 18. Smartcard supply supervisor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 19. EMS characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 20. EMI characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 21. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 22. Electrical sensitivities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 23. USB DC electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 24. USB full speed electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 25. 24-lead very thin fine pitch quad flat no-lead 5x5mm,0.65mm pitch, mechanical data. . . . 25 Table 26. 24-pin plastic small outline package- 300-mil width, mechanical data . . . . . . . . . . . . . . . . 26 Table 27. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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List of figures	ST7GEME4

List of figures

Figure 1. ST7GEME4 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. 24-lead VFQFPN package pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 3. 24-pin SO package pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 4. Smartcard interface reference application - 24-pin SO package . . . . . . . . . . . . . . . . . . . . . 9 Figure 5. Typical application with an external clock source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 6. Typical application with a crystal resonator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Figure 7. USB data signal rise and fall time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 8. 24-lead very thin fine pitch quad flat no-lead 5x5 mm 0.65 mm pitch, package outline . . . 25 Figure 9. 24-pin plastic small outline package- 300-mil width, package outline. . . . . . . . . . . . . . . . . 26

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ST7GEME4	Introduction

1 Introduction

The ST7GEME4 device is a member of the ST7 microcontroller family designed for USB applications. All devices are based on a common industry-standard 8-bit core, featuring an enhanced instruction set.

The ST7GEME4 is factory-programmed ROM devices and as such are not reprogrammable.

It operates at a 4 MHz external oscillator frequency.

Under software control, all devices can be placed in Halt mode, reducing power consumption when the application is in idle or stand-by state.

The enhanced instruction set and addressing modes of the ST7 offer both power and flexibility to software developers, enabling the design of highly efficient and compact application code. In addition to standard 8-bit data management, all ST7 microcontrollers feature true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes.

The ST7GEME4 includes an ST7 Core, up to 16 Kbytes of program memory, up to 512 bytes of user RAM and the following on-chip peripherals:

●USB full speed interface with 7 endpoints, programmable in/out configuration and embedded 3.3 V voltage regulator and transceivers (no external components are needed).

●ISO 7816-3 UART interface with programmable baud rate from 372 clock pulses up to 11.625 clock pulses

●Smartcard supply block able to provide programmable supply voltage and I/O voltage levels to the smartcards

●Low voltage reset ensuring proper power-on or power-off of the device (selectable by option)

●8-bit timer (TBU)

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Introduction	ST7GEME4

Figure 1. ST7GEME4 block diagram

OSCIN

4MHz

PA[1:0]

OSCOUT

OSCILLATOR

PORT A

	PLL
48 MHz						8 MHz
					DIVIDER
						or 4 MHz

USB

DATA

BUFFER (256 bytes)

USBDP

USBDM USB USBVCC

8-BIT TIMER

BUS DATA AND ADDRESS

LED						LED0

ISO 7816 UART

SUPPLY

MANAGER

	PA6	CONTROL		DIODE
			DC/DC	SELF
	VPP	8-BIT CORE		CRDVCC
			CONVERTER
		ALU		CRDDET
		LVD		CRDIO
		RAM		CRDC4
				CRDC8
		(512 Bytes)
		PROGRAM	3V/1.8V Vreg	CRDRST
		MEMORY		CRDCLK
		(16K Bytes)

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ST7GEME4	Pin description

2 Pin description

Figure 2. 24-lead VFQFPN package pinout

	GND	GNDA	DIODE	SELF	VDD	VDDA
		23	22	21	20	19
	24
CRDVCC	1					18	USBVCC
CRDRST	2					17	DP
CRDCLK	3					16	DM
C4	4					15	LED0
CRDIO	5					14	PA6
C8	6					13	VPP
	7	8	9	10	11	12
	CRDDET	ICCDATA/WAKUP2/	ICCCLK/WAKUP2	NC	OSCIN	OSCOUT

Figure 3. 24-pin SO package pinout

DIODE	1	24		SELF
GNDA	2	23		VDD
GND	3	22		VDDA
CRDVCC	4	21		USBVcc
CRDRST	5	20		DP
CRDCLK	6	19		DM
C4	7	18		LED0
CRDIO	8	17		PA6
C8	9	16		VPP
CRDDET	10	15		OSCOUT
ICCDATA/WAKUP2/	11	14		OSCIN
ICCCLK/WAKUP2/P	12	13		NC

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Pin description	ST7GEME4

Legend / Abbreviations

●Type: I = input, O = output, S = supply

●In/Output level: CT = CMOS 0.3VDD/0.7VDD with input trigger

●Output level: HS = 10mA high sink (on N-buffer only)

●Port and control configuration:

–Input: float = floating, wpu = weak pull-up, int = interrupt, ana = analog

–Output: OD = open drain, PP = push-pull

Table 2.

Pin description

Pin number

Pin name

Level

supplied

Port / Control

function

Alternate function

Main

VFQFPN24

SO24

Type

Input

Output

V

wpu

int

OD

PP

Input

Output

CARD

(after reset)

2

5

CRDRST

O

CT

X

X

Smartcard reset

3

6

CRDCLK

O

CT

X

X

Smartcard clock

4

7

C4

O

CT

X

X

Smartcard C4

5

8

CRDIO

I/O

CT

X

X

X

Smartcard I/O

6

9

C8

O

CT

X

X

Smartcard C8

7

10

CRDDET

I

C

X

Smartcard detection

T

8

11

PA0/WAKUP2/

I/O

CT

X

X

X

X

Port A0

Interrupt, In-circuit

ICCDATA

communication data input

9

12

PA1/WAKUP2/

I/O

CT

X

X

X

X

Port A1

Interrupt, In-circuit

ICCCLK

communication clock input

11

14

OSCIN

C

Input/output oscillator pins. These pins

T

connect a 4 MHz parallel-resonant crystal, or

12

15

OSCOUT

CT

an external source to the on-chip oscillator.

13

16

VPP

S

Must be held low in normal operating mode.

14

17

PA6

I

C

PA6

T

15

18

LED0

O

HS

X

Constant current output

16

19

DM

I/O

CT

USB Data Minus line

17

20

DP

I/O

CT

USB Data Plus line

18

21

USBVCC

O

CT

3.3 V output for USB

19

22

VDDA

S

Power Supply voltage 4-5.5 V

20

23

VDD

S

Power Supply voltage 4-5.5 V

21

24

SELF

O

CT

An external inductance must be connected to

these pins for the step up converter

22

1

DIODE

S

CT

An external diode must be connected to this

pin for the step up converter

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ST7GEME4

Pin description

Table 2.

Pin description (continued)

Pin number

Pin name

Level

supplied

Port / Control

function

Alternate function

Main

VFQFPN24

SO24

Type

Input

Output

V

wpu

int

OD

PP

Input

Output

CARD

(after reset)

23

2

GNDA

S

Ground

24

3

GND

S

1

4

CDRVCC

O

CT

X

Smartcard supply pin

Figure 4. Smartcard interface reference application - 24-pin SO package

C3

C4

C5

C6

VDD

C1

L1

D1

DIODE

SELF

VDD

GNDA

VDD

GND

VDDA

C2

CRDVCC

USBVcc

R

CRDRST

DP

CRDCLK

DM

D+

D-

C4

LED0

LED VDD

CRDIO

PA6

C8

VPP

C

L1

CRDDET OSCOUT

PA0

OSCIN

PA1

NC

CL2

1.Mandatory values for the external components:

C1 = 4.7 µF; C2 = 100 nF. C1 and C2 must be located close to the chip (refer to Section 4.4.2.).

C3 = 1 nF;

C4 = 4.7 µF ESR 0.5 Ω.

C5 : 470 pF;

C6 : 100 pF; R : 1.5kΩ;

L1 : 10 µH, 2 Ω;

Crystal 4.0 MHz; Impedance max100 Ω D1: BAT42 SHOTTKY.

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