Datasheet > WM71008-NBSD-DATR

WM71008-NBSD-DATR

更新时间： 2024-02-17 11:58:05

品牌	Logo	应用领域
铁电 - RAMTRON		光电二极管内存集成电路
页数	文件大小	规格书
17页	1898K
描述
Memory Circuit, PDSO8, 3 X 3 MM, 0.65 MM PITCH, GREEN, UDFN-8

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WM71008-NBSD-DATR 技术参数

生命周期：	Obsolete	零件包装代码：	DFN
包装说明：	,	针数：	8
Reach Compliance Code：	unknown	HTS代码：	8542.32.00.71
风险等级：	5.84	JESD-30 代码：	S-PDSO-N8
内存集成电路类型：	MEMORY CIRCUIT	端子数量：	8
封装主体材料：	PLASTIC/EPOXY	封装形状：	SQUARE
封装形式：	SMALL OUTLINE	认证状态：	Not Qualified
表面贴装：	YES	端子形式：	NO LEAD
端子位置：	DUAL	Base Number Matches：	1

WM71008-NBSD-DATR 数据手册

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WM710xx – Secure F-RAM with Gen-2 RFID

GEN2 WM710XX MEMORY BANKS

The RFID memory banks reside in Ramtron’s non-volatile F-RAM memory. F-RAM brings many benefits to

the WM710xx. The first benefit is the size of the memory itself – up to 16k-bit, most of which is available in

the USER memory bank. F-RAM’s impact on the Gen2 protocol is most dramatically seen when writing to

WM710xx memory. Unlike EEPROM memory, no charge pump or memory soak time is required to write to

WM710xx memory, resulting in zero time and zero power penalties. The write cycle is completed

immediately, allowing an interrogator to continue writing additional data to memory with no time penalty

incurred due to the memory itself. A comparison between F-RAM and EEPROM memories is shown in Figure

3. The figure shows the minimum number of Gen2 instructions required to perform a SELECT,

INVENTORY, and ACCESS sequence of commands to write a data word to memory. The same interrogator

command sequence is transmitted to the WM710xx and an EEPROM-based RFID. The effect of the EEPROM

time penalty is shown within the context of the protocol.

Figure 3. Gen2 Memory Write Cycle Comparison: F-RAM vs. EEPROM Memories

RESERVED: KILL Password:

The kill password provides a mechanism to permanently disable the WM710xx RFID from responding to any

and all Gen2 interrogator commands. The mandatory KILL command can be issued by a RFID interrogator in

either the OPEN or SECURED states. The WM710xx is permanently killed through a four-instruction

sequence of REQRN and KILL commands as detailed in the Gen2 standard. The KILL password is a 32-bit

value stored as 2 16-bit data words in reserved memory. The most significant KILL password is stored in

reserved memory bank address 0x00 with the least significant word stored in reserved memory bank address

0x01. The kill function can be permanently disabled by setting both KILL password words to 0x0000, and

permanently locking the KILL password in the reserved memory bank. Once the kill password has been set, it

should be permanently locked using the LOCK command. The WM710xx is shipped from the factory with the

kill password memory unlocked.

RESERVED: ACCESS Password:

The access password provides a security mechanism to prevent unauthorized RFID interrogators from writing

to WM710xx memory. Non-zero access passwords require the WM710xx be placed in the SECURED state

prior to writing to it. This is accomplished through four consecutive REQRN and ACCESS commands as

described in the Gen2 standard. An access password with a value of zero requires no authentication prior to

writing to WM710xx memory. The ACCESS password is a 32-bit value stored as 2 16-bit data words in

reserved memory. The most significant ACCESS password is stored in reserved memory bank address 0x02

with the least significant word stored in reserved memory bank address 0x03. Once the access password has

Rev. 1.2

Sept. 2010

Page 5 of 17

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与WM71008-NBSD-DATR相关器件

型号	品牌	获取价格	描述	数据表
WM71016-6-DGTR	RAMTRON	获取价格	Memory Circuit
WM71016-NBSD-DA	RAMTRON	获取价格	Memory Circuit, PDSO8, 3 X 3 MM, 0.65 MM PITCH, GREEN, UDFN-8
WM71016-NBSD-DATR	RAMTRON	获取价格	Memory Circuit, PDSO8, 3 X 3 MM, 0.65 MM PITCH, GREEN, UDFN-8
WM7120A	WOLFSON	获取价格	Top Port Analogue Silicon Microphone
WM7120AE	WOLFSON	获取价格	Top Port Analogue Silicon Microphone
WM7120AIMS/RV	CIRRUS	获取价格	Analog Circuit, 1 Func, CMOS, PBGA4, 3.76 X 2.95 MM, 1.10 MM HEIGHT, HALOGEN AND LEAD FREE
WM7120AIMS/V	CIRRUS	获取价格	Analog Circuit, 1 Func, CMOS, PBGA4, PACKAGE-4
WM7120AIMSE/RV	CIRRUS	获取价格	Analog Circuit, 1 Func, CMOS, PBGA4, PACKAGE-4
WM7120AIMSE/V	CIRRUS	获取价格	Analog Circuit, 1 Func, CMOS, PBGA4, PACKAGE-4
WM7120IMS/RV	CIRRUS	获取价格	Analog Circuit

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