DM2016 SDMC | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 8
Technical content
V 2 . 2 Sep 04,2008 Lable of Contents 6.1 I
V 2 . 2 Sep 04,2008 1、 FEATURES z Compliant with I C bus standard z Support 2 I C address select z Embedded 128bit OTP memory for key z Embedded 1024bit EEPROM, support single byte writing and multiple bytes reading z The interval of EEPROM writing operation is 12ms z Package type:SOP8 2、 BLOCK DIAGRAM
V 2 . 2 Sep 04,2008 3、 SUMMARY DM2016 is an encryption chip to prevent from copying. It can effectively protect software design through a decryption arithmetic and the relative secret key of 128 bits. When inputting encrypted code,the decryption will be excuted,and then generates the plain code.The secret keys are stored in 128bit OTP memory. Besides the decryption function, DM2016 embeds 1024bit EEPROM to store data,all the data transfer is through I C bus. 4、 PIN CONNECTION 5、 PIN DESCRIPTION Pin Number Signal Name I/O Type Function
1 A0 I TTL I
2 STA I TTL Reset，High level is active
3 NC Not connect
4 GND / Power Power ground
5 SDA B TTL I
6 SCL I TTL I
7 NC Not connect
8 VCC / Power Power supply 3.3V Note: STA Signal only accept resistance capacitance reset，The time of STA pulse with is two milliseconds； and high level must be attained 2V.( The STA pin not support GPIO reset)
V 2 . 2 Sep 04,2008 6、 FUNCTION DESCRIPTION 6.1 I C DM2016 has an I C salve device interface,there are two I C device addresses can be selected through controlling the external port.The high 6-bit of I2C address is “101000”,so the I C device address can be selected with 0xA0，0xA2. I C data address space assignment: Address Description 0x00-0x7F EEPROM 0x80-0x8F 128 bit secret key 0x90-0x97 64 bit plain code and encrypted code The most signification byte of 128 bit secret key is stored in address “0x80”; The least signification byte of 128 bit secret key is stored in address “0x8F”. The most signification byte of 64 bit plain code or encrypted code is stored in address “0x90”,the least signification byte of 64 bit plain code or encrypted code is stored in address“0x97”.When reading,the data is plain code.When writing,the data is encrypted code.
6.2 Decryption Function
DM2016 is a security chip to prevent from copying. It can effectively protect software design through a decryption arithmetic and the relative 128 bit secret key. The 128 bit secret keys are stored in OTP memory. The authentication process of DM2016 is as below: A group of 64bit random data generated by program acts as plain code. Program executes the encryption arithmetic by utilizing the plain code and the same secret key in 128 bit OTP memory, and generates a group of encrypted code. Then program sends the encrypted code to DM2016 through I C interface.DM2016 executes the decryption arithmetic with 128 bit secret key and 64 bit encrypted code, then generates a group of 64 bit plain code. Program reads back the plain code through I C interface, then compares the plain code with the original plain code(64bit random data).If the two values are equal, it will declare that the authentication pass and the program will continue to execute. Otherwise, the program will exit.
V 2 . 2 Sep 04,2008
6.3 EEPROM
DM2016 embeds 1024 bit EEPROM for users to store data. The access of EEPROM is through I C interface.
6.4 OTP memory
DM2016 embeds 128 bit OTP memory to store secret key.The access of OTP is also through I C interface. OTP can only be written one time and can not be read. 7、 ELECTRICAL CHARACTERISTICS
7.1 Absolute Maximum Ratings
Symbol Parameter Value Unit Vs Power Supply -0.5 to 3.6 V Vp Signal Supply Voltage -0.3 to 5.5 V Tstg Storage Temperature 0-125 ℃ Iout Output Current 8 mA
7.2 Operating Conditions
Symbol Parameter Min Type Max Unit VDD Power Supply 3.0 3.3 3.6 V VIL Input Low Voltage -0.3 0.8 V VIH Input High Voltage 2.0 5.5 VIL VOL Output Low Voltage 0.4 V VOH Output High Voltage 2.4 uA IOZ Tristate Output Leakage Current -10 +10 uA IL Input Leakage Current -10 +10 uA IOL Output Low Current @ V OL=0.4V 2.2 3.4 4.0 mA IOH Output High Current @ V OL=2.4V 2.89 4.78 6.63 mA TJ Junction temperature 0 25 70 ℃
V 2 . 2 Sep 04,2008
7.3 I2C Chronograms
I C Chronograms I C Characteristics Parameter Symbol Min Max Unit SCL frequency fSCL 400 KHz Bus free time between stop and start tBUF 1.3 µ s Hold time start condition tHD,STA 0.9 µ s SCL low period tLOW 1.3 µ s SCL high period tHIGH 0.9 µ s Setup time before a repeated start tSU,STA 0.9 µ s Data hold time tHD,DAT 0 0.9 µ s Data setup time tSU,DAT 100 ns Rise time for both SDA and SCL signals tR 20 300 ns Fall time for both SDA and SCL signals tF 20 300 ns Setup time before a stop condition tSU,STO 0.9 µ s Capacitive load for each bus line Cb 400 pF
V 2 . 2 Sep 04,2008 8、 PACKAGE OUTLINE