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DS8024-RRX+T&R

更新时间： 2024-01-17 01:12:20

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
15页	304K
描述
Microprocessor Circuit, CMOS, PDSO28, SOP-28

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技术参数
数据手册

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DS8024-RRX+T&R 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	SOP,	Reach Compliance Code：	compliant
HTS代码：	8542.31.00.01	Factory Lead Time：	6 weeks
风险等级：	5.6	JESD-30 代码：	R-PDSO-G28
长度：	17.9 mm	端子数量：	28
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
座面最大高度：	2.65 mm	最大供电电压：	6 V
最小供电电压：	2.7 V	标称供电电压：	3.3 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
宽度：	7.5 mm	uPs/uCs/外围集成电路类型：	MICROPROCESSOR CIRCUIT
Base Number Matches：	1

DS8024-RRX+T&R 数据手册

Smart Card Interface

DS8024

When a card is inserted into the reader (if PRES is

active), the host microcontroller can begin an activation

sequence (start a card session) by pulling CMDVCC

low. The following events form an activation sequence

(Figure 3):

An alternate sequence allows the application to control

when the clock is applied to the card.

1) Host: Set RSTIN high.

2) Host: Set CMDVCC low.

3) Host: Set RSTIN low between t and t ; CLK will now

1) Host: CMDVCC is pulled low.

start.

2) DS8024: The internal oscillator changes to high

4) DS8024: RST stays low until t , then RST becomes

frequency (t ).

the copy of RSTIN.

3) DS8024: The voltage generator is started

5) DS8024: RSTIN has no further effect on CLK after t .

(between t and t ).

If the applied clock is not needed, set CMDVCC low

4) DS8024: V

rises from 0 to 5V or 3V with a con-

with RSTIN low. In this case, CLK starts at t (minimum

trolled slope (t = t + 1.5 × T). T is 64 times the

200ns after the transition on I/O, see Figure 4); after t ,

internal oscillator period (approximately 25µs).

RSTIN can be set high to obtain an answer to request

(ATR) from an inserted smart card. Do not perform acti-

vation with RSTIN held permanently high.

5) DS8024: I/O, AUX1, and AUX2 are enabled (t =

t + 4T).

6) DS8024: The CLK signal is applied to the C3 con-

Active Mode

tact (t ).

When the activation sequence is completed, the

DS8024 card interface is in active mode. The host

microcontroller and the smart card exchange data on

the I/O lines.

7) DS8024: RST is enabled (t = t + 7T).

CMDVCC

ATR

I/O

CLK

RSTIN

RST

I/OIN

t = t

5 ACT

Figure 3. Activation Sequence Using RSTIN and CMDVCC

_______________________________________________________________________________________

1...6 7 8910 11 12...15

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