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参数资料
| 型号： | TDA8005 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Low-Power Smart Card Coupler(低功耗智能卡藕合器) |
| 中文描述： | 低功耗智能卡器（低功耗智能卡藕合器） |
| 文件页数： | 32/32页 |
| 文件大小： | 198K |
| 代理商： | TDA8005 |
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1996 Sep 25
9
Philips Semiconductors
Product specication
Low-power smart card coupler
TDA8005
FUNCTIONAL DESCRIPTION
Microcontroller
The microcontroller is an 80CL51 with 256 bytes of RAM
instead of 128. The baud rate of the UART has been
multiplied by four in modes 1, 2 and 3 (which means that
the division factor of 32 in the formula is replaced by 8 in
both reception and transmission, and that in the reception
modes, only four samples per bit are taken with decision
on the majority of samples 2, 3 and 4) and the delay
counter has been reduced from 1536 to 24.
Remark: this has an impact when getting out of
PDOWN mode. It is recommended to switch to internal
clock before entering PDOWN mode
(see
“application report”).
All the other functions remain unchanged. Please, refer to
the published specification of the 80CL51 for any further
information. Pins INT0, P10, P04 to P07 and P24 to P27
are used internally for controlling the smart card interface.
Mode 0 is unchanged. The baud rate for modes 1 and 3 is:
The baud rate for mode 2 is:
Table 1
Mode 3 timing
BAUD
RATE
fclk = 6.5 MHz;
VDD =5V
fclk = 3.25 MHz;
VDD =5or3V
SMOD
TH1
SMOD
TH1
135416
1
255
67708
0
255
1
255
45139
1
253
33854
0
254
0
255
27083
1
251
22569
0
253
1
253
16927
0
254
13542
1
251
11285
0
250
0
253
2
SMOD
8
------------------
f
clk
12
256
TH1
)
–
(
×
--------------------------------------------------
×
2
SMOD
16
------------------
f
clk
×
Supply
The circuit operates within a supply voltage range of
2.5 to 6 V. The supply pins are VDDD, DGND and AGND.
Pins VDDA and AGND supply the analog drivers to the card
and have to be externally decoupled because of the large
current spikes that the card and the step-up converter can
create. An integrated spike killer ensures the contacts to
the card remain inactive during power-up or power-down.
An internal voltage reference is generated which is used
within the step-up converter, the voltage supervisor, and
the VCC generator.
The voltage supervisor generates an alarm pulse, whose
length is defined by an external capacitor tied to the
DELAY pin, when VDDD is too low to ensure proper
operation (1 ms per 1 nF typical). This pulse is used as a
RESET pulse by the controller, in parallel with an external
RESET input, which can be tied to the system controller.
It is also used in order to either block any spurious card
contacts during controllers reset, or to force an automatic
deactivation of the contacts in the event of supply drop-out
[see Sections “Activation sequence” and “Deactivation
sequence (see Fig.10)”].
In the 64 pin version, this reset pulse is output to the open
drain ALARM pin, which may be selected active HIGH or
active LOW by mask option and may be used as a reset
pulse for other devices within the application.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA8005A | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low-power 3 V/5 V smart card coupler |
| TDA8005AG | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low-power 3 V/5 V smart card coupler |
| TDA8005AH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low-power 3 V/5 V smart card coupler |
| TDA8005G | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low-power smart card coupler |
| TDA8005H | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low-power smart card coupler |
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