CN201689880U

CN201689880U - Safe chip

Info

Publication number: CN201689880U
Application number: CN2009203193759U
Authority: CN
Inventors: 刘鑫; 尹洪兵; 柳建勇
Original assignee: Nationz Technologies Inc
Current assignee: Nationz Technologies Inc
Priority date: 2009-12-31
Filing date: 2009-12-31
Publication date: 2010-12-29
Anticipated expiration: 2019-12-31

Abstract

The utility model relates to a safe chip, which comprises a chip body, wherein a VR25 module is arranged in the chip body, the safe chip adopts a square flat lead-pin-free QFN for encapsulation, one pipe pin of the safe chip is connected with the VR25 module, in addition, the pipe pin is externally connected with a capacitor, and the other end of the capacitor is grounded (GND). The safe chip of the utility model improves the stability of the safe chip.

Description

A kind of safety chip

Technical field

The utility model relates to a kind of safety chip.

Background technology

Along with the continuous progress of network technology and software engineering, the computer security mechanism that realizes based on pure software can't satisfy ecommerce and government affairs computer security demand partly.For this reason, China has set up trusted computer working group (ChinaTCMUnion is called for short TCMU), and being intended to formulate a series of is the credible basis of calculation on basis based on secure hardware, is called the TCM standard.And the TCM safety chip is meant the safety chip that meets the TCM consensus standard, can protect PC effectively, prevent disabled user's visit based on the security mechanism of TCM safety chip exploitation.The chip that meets the TCM standard at first must have the function that produces cryptographic keys; must be able to carry out data encrypt/decrypt at a high speed in addition; and serve as the auxiliary processor that protection BIOS (BasicInput/OutputSystem, basic input output system) and operating system are not modified.

What the TCM chip adopted is that LPC (LowPin Count, low pin interface agreement) communication interface and main frame are mutual, the LPC interface protocol, and it is the high-speed interface between board chip set and the single plate peripheral function.Because TCM is widely used in the PC system, so the pin of TCM chip must satisfy the LPC communication function.What traditional TCM chip adopted is the TSSOP28 encapsulation, the profile of the chip of its encapsulation is a rectangle, and all there is the I/O pin to stretch out around the encapsulation, its pin is in chip exterior, easily bending and fracture, and the area of its encapsulation big (be 6.1mmx9.7mm) need take PCB (PrintedCircuit Board greatly, printed circuit board (PCB)) space is unfavorable for portable equipment.

The IP kernel of TCM chip and memory need use 2.5V power supply, and the voltage that is input to TCM is 3.3V, and therefore, the TCM chip need add the VR25 module, and 3.3V is converted to 2.5V.The TCM chip needs a large amount of hardware algorithm engines to participate in computing to reach arithmetic speed faster when operate as normal, when the algorithm engine full speed running, power consumption rises rapidly, may cause the voltage of TCM chip to drop to below the normal working voltage, produce ripple voltage, operate as normal to internal logic produces harmful effect, causes hardware algorithm engine modules operation mistake easily.

The utility model content

Technical problem to be solved in the utility model provides a kind of safety chip, improves the stability of safety chip.

For solving the problems of the technologies described above, the utility model proposes a kind of safety chip, comprise the chip body, be provided with the VR25 module in the described chip body, described safety chip adopts quad flat non-pin QFN encapsulation, a pin of described safety chip is connected with described VR25 module, and the external electric capacity of this pin, the other end ground connection GND of this electric capacity.

Further, above-mentioned safety chip also can have following feature, described chip body be shaped as square.

Further, above-mentioned safety chip also can have following feature, and described safety chip adopts the QFN40 encapsulation, and 40 pins are uniformly distributed in four sides of described safety chip.

Further, above-mentioned safety chip also can have following feature, and the 13rd pin of described safety chip is connected with described VR25 module.

Further, above-mentioned safety chip also can have following feature, and described safety chip has 8 GND pins, and described 8 GND pins are uniformly distributed in four sides of described safety chip.

Further, above-mentioned safety chip also can have following feature, and each side of described safety chip all is provided with 1 GND pin respectively at least.

Further, above-mentioned safety chip also can have following feature, and 40 pins of described safety chip are defined as follows respectively:

1st, 8,9,17,18,27,28 and 40 pins are the GND pin;

2nd, 12,32-37 and 39 is NC pin (being undefined pin);

The 3rd pin is GPI03;

The 4th pin is PP;

The 5th pin is BADD0

6th, 7,19,20,25,26 pins are VCC3;

The 10th pin is GPIO15;

The 11st pin is GPIO16;

The 13rd pin is the VR25 pin;

The 14th pin is CLKRUN#;

The 15th pin is LRESET#;

The 16th pin is LAD3;

The 21st pin is LAD2;

The 22nd pin is LCLK;

The 23rd pin is LFRAME#;

The 24th pin is LAD1;

The 29th pin is LAD0;

The 30th pin is SERIRQ;

The 31st pin is LPCPD#;

The 38th pin is BADD1.

Further, above-mentioned safety chip also can have following feature, and described safety chip is TCM chip or TPM chip.

Safety chip of the present utility model has improved the stability of safety chip.

Description of drawings

Fig. 1 is the pin figure of safety chip among the utility model embodiment;

Fig. 2 is the position view of VR25 module among the utility model embodiment;

Fig. 3 is the upward view of safety chip shown in Figure 1;

Fig. 4 is the schematic perspective view of safety chip shown in Figure 1.

Embodiment

Below in conjunction with accompanying drawing principle of the present utility model and feature are described, institute gives an actual example and only is used to explain the utility model, is not to be used to limit scope of the present utility model.

Safety chip of the present utility model comprises TCM chip and TPM (TrustedPlatform Module, reliable platform module) chip, also can comprise the chip of other type.

Safety chip of the present utility model comprises the chip body, is provided with the VR25 module in the chip body, and safety chip adopts quad flat non-pin QFN encapsulation.Quad flat non-pin package QFN is that a kind of pad size is little, volume is little, with the emerging surface mount chip encapsulation technology of plastics as encapsulant, because the pad of bottom center big exposure is soldered on the heat radiation pad of PCB, makes QFN have splendid electricity and hot property.

After safety chip of the present utility model adopts the QFN encapsulation, have following advantage: does not 1. have the pin pad design and occupies littler PCB chip area, chip approach (＜1mm), in light weight, be not only applicable to the demand of Desktop PC, also can be applicable to portable mobile equipment; 2. impedance and self-induction are very low, can satisfy at a high speed or the application of microwave; 3. because large-area heat radiation pad is arranged at the bottom, so its hot property is very good, the operation meeting of entire chip is very stable, can not be affected.Therefore, the safety chip of the present utility model that adopts QFN to encapsulate has improved the stability of safety chip.

Fig. 1 is the pin figure of safety chip among the utility model embodiment, and Fig. 3 is the upward view of safety chip shown in Figure 1, and Fig. 4 is the schematic perspective view of safety chip shown in Figure 1.By shown in Figure 1, in the present embodiment, safety chip chip body is provided with the VR25 module in this chip body, and preferably, present embodiment chips body is a square.During this example was novel, the packing forms of chip was the QFN40 encapsulation, and the QFN40 encapsulation itself is foursquare, and the pin design of VR25 also can be applied to rectangle, but packing forms will change.That is to say that in other embodiment of the present utility model, the chip body also can be designed to other shape, as common rectangle etc.

Safety chip shown in Figure 1 adopts the QFN40 encapsulation, has 40 pins, and 40 pins are uniformly distributed in four sides of safety chip.And in the present embodiment, safety chip has 8 GND pins, and these 8 GND pins are uniformly distributed in four sides of safety chip.In the chip of employing QFN40 encapsulation shown in Figure 1, the 1st, 8,9,17,18,27,28 and 40 pin is the GND pin, and they are distributed in four sides of safety chip.In other embodiment of the present utility model, the number of GND pin can arbitrarily be set, and need only guarantee that each side of safety chip all is provided with 1 GND pin respectively at least.Because the GND pin is evenly distributed in four sides of safety chip, reduced a certain GND pin effectively and opened circuit and produce the problem of voltage reference skew, strengthened the stability of safety chip effectively.

In addition, defining outside the above-mentioned GND pin, among Fig. 1, the pin of other on the chip body is defined as respectively:

2nd, 12,32-37 and 39 is NC pin (being undefined pin);

The 3rd pin is GPIO3;

The 4th pin is PP;

The 5th pin is BADD0;

6th, 7,19,20,25,26 pins are VCC3;

The 10th pin is GPIO15;

The 11st pin is GPIO16;

The 13rd pin is the VR25 pin;

The 14th pin is CLKRUN#;

The 15th pin is LRESET#;

The 16th pin is LAD3;

The 21st pin is LAD2;

The 22nd pin is LCLK;

The 23rd pin is LFRAME#;

The 24th pin is LAD1;

The 29th pin is LAD0;

The 30th pin is SERIRQ;

The 31st pin is LPCPD#;

The 38th pin is BADD1.

The implication of each pin is as shown in table 1 among Fig. 1:

Each pin detail list among table 1 Fig. 1

Pin name	The pin sequence number	Describe
			LRESET#	?15	The control pin that resets of LPC interface
LAD[3:0]	?16，21，24，29	The data-signal pin of LPC interface
			LCLK	?22	The LPC/PCI clock signal
LFFAME#	?23	The frame synchronizing signal pin of LPC interface
			SERIRQ	?30	The interrupt signal pin of LPC interface
LPCPD#	?31	The PD pattern pin of LPC interface
			GPIO3， GPIO15， GPIO16	?3，10，11	The GPIO signal
BADD1， BADD0	?38，5	Bus address 0 pin of LPC interface
			PP	?4	The PP pin of LPC interface
CLKRUN#	?14	The clock control pin of LPC interface
			NC	?2，12，32，33，?34，35，36，37，?39	Do not use
VR25	?13	The power supply output of chip internal connects electric capacity nearby to ground

GND	?1，8，9，17，18，?27，28，40	Systematically
			VCC3	?6，7，19，20，?25，26	3.3V system power supply

Certainly can also be from different pin open numberings, and adopt different counting directions to number, these all variations and change and do not break away from the justice that should have of the present utility model.

Again as shown in Figure 1, in the present embodiment, the 13rd pin is connected with the VR25 module, certainly, the pin that also can define other is connected with the VR25 module.The VR25 module is the module that the voltage transitions that safety chip is external becomes 2.5V.

Fig. 2 is the position view of VR25 module among the utility model embodiment, among Fig. 2, VR25 module one end is connected with internal logic with memory (such as the flash module among Fig. 2), the other end is VR25I/O, even the VR25 module also can be analyzed and abnormality processing residing electrical characteristic by the VR25 pin along with unsteady (as 3.0-3.6V) or the algoritic module operation of external power source voltage cause electrical characteristic difference.Preferably, with pin that the VR25 module is connected on be circumscribed with an electric capacity, the other end ground connection GND of this electric capacity.Preferably, the capacitance of this electric capacity is 1 μ f (1 microfarad).

Safety chip of the present utility model has improved the stability of safety chip.Safety chip of the present utility model is except can being applied to portable or desktop computer, also can be applicable to point of sales terminal (POS) and consumer electronics (CE) equipment, the Internet portable terminal, smart mobile phone etc., to prevent to be subjected to the harm that business data is lost, personal identification is stolen, credit card is swindled.

The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1. safety chip, comprise the chip body, be provided with the VR25 module in the described chip body, it is characterized in that, described safety chip adopts quad flat non-pin QFN encapsulation, a pin of described safety chip is connected with described VR25 module, and the external electric capacity of this pin, the other end ground connection GND of this electric capacity.

2. safety chip according to claim 1 is characterized in that, described chip body be shaped as square.

3. safety chip according to claim 2 is characterized in that, described safety chip adopts the QFN40 encapsulation, and 40 pins are uniformly distributed in four sides of described safety chip.

4. safety chip according to claim 3 is characterized in that, the 13rd pin of described safety chip is connected with described VR25 module.

5. safety chip according to claim 3 is characterized in that, described safety chip has 8 GND pins, and described 8 GND pins are uniformly distributed in four sides of described safety chip.

6. safety chip according to claim 1 is characterized in that, each side of described safety chip all is provided with 1 GND pin respectively at least.

7. according to each described safety chip of claim 1 to 6, it is characterized in that described safety chip is TCM chip or TPM chip.