Datasheet > 微控制器和处理器 > 其他 uPs/uCs/外围集成电路> DS8024-RRX+T&R

DS8024-RRX+T&R

更新时间： 2024-01-05 16:37:16

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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中文翻译

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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

There are two different cases for how the DS8024

reacts to fault detection (Figure 6):

Deactivation Sequence

When the host microcontroller is done communicating

with the smart card, it sets the CMDVCC line high to

execute an automatic deactivation sequence and

returns the card interface to the inactive mode.

• Outside a Card Session ꢁCMDVCC Highꢂ. Output

OFF is low if a card is not in the card reader and

high if a card is in the reader. The V

supply is

monitored—a decrease in input voltage generates

an internal power-on reset pulse but does not

affect the OFF signal. Short-circuit and tempera-

ture detection are disabled because the card is

not powered up.

The following sequence of events occurs during a

deactivation sequence (Figure 5):

1) RST goes low (t ).

2) CLK is held low (t = t + 0.5 × T), where T is 64

times the period of the internal oscillator (approxi-

mately 25µs).

• Within a Card Session ꢁCMDVCC Lowꢂ. Output

OFF goes low when a fault condition is detected,

and an emergency deactivation is performed auto-

matically (Figure 7). When the system controller

resets CMDVCC to high, it may sense the OFF

level again after completing the deactivation

sequence. This distinguishes between a card

extraction and a hardware problem (OFF goes high

again if a card is present). Depending on the con-

nector’s card-present switch (normally closed or

normally open) and the mechanical characteristics

of the switch, bouncing can occur on the PRES sig-

nals at card insertion or withdrawal.

3) I/O, AUX1, and AUX2 are pulled low (t = t + T).

4) V

starts to fall (t = t + 1.5 × T).

14 10

5) When V

reaches its inactive state, the deactiva-

tion sequence is complete (at t ).

6) All card contacts become low impedance to GND;

I/OIN, AUX1IN, and AUX2IN remain at V

(pulled

up through an 11kΩ resistor).

7) The internal oscillator returns to its lower frequency.

Generator

The DS8024 has a debounce feature with an 8ms typi-

cal duration (Figure 6). When a card is inserted, output

OFF goes high after the debounce time delay. When

the card is extracted, an automatic deactivation

sequence of the card is performed on the first true/false

transition on PRES and output OFF goes low.

The card voltage (V ) generator can supply up to

80mA continuously at 5V or 65mA at 3V. An internal

overload detector triggers at approximately 120mA.

Current samples to the detector are filtered. This allows

spurious current pulses (with a duration of a few µs) up

to 200mA to be drawn without causing deactivation.

The average current must stay below the specified

maximum current value.

Stop Mode (Low-Power Mode)

The DS8024 (like the TDA8024) does not support a low-

power stop mode. For applications requiring low-power

support, refer to the DS8113.

See the Applications Information section for recommen-

dations to help maintain V

voltage accuracy.

Fault Detection

Smart Card Power Select

The DS8024 integrates circuitry to monitor the following

fault conditions:

The DS8024 supports two smart card V

voltages: 3V

and 5V. The power select is controlled by the 5V/3V

signal as shown in Table 3. V is 5V if 5V/3V is assert-

• Short-circuit or high current on V

ed to a logic-high state, and V

to a logic-low state.

is 3V if 5V/3V is pulled

• Card removal while the interface is activated

• V dropping below threshold

• Card voltage generator operating out of the speci-

Table 3. k

Select and Operation Mode

fied values (V

too high)

too low or current consumption

DDA

CARD INTERFACE

STATUS

5V/3V

CMDVCC

SELECT (V)

• Overheating

Activated

Inactivated

Activated

Inactivated

______________________________________________________________________________________ 11

1...8 9 101112 13 14 15

中文翻译

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