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参数资料
| 型号： | DS2703UT |
| 英文描述： | SHA-1 Battery Pack Authentication IC |
| 中文描述： | SHA - 1的电池组认证IC |
| 文件页数： | 14/20页 |
| 文件大小： | 238K |
| 代理商： | DS2703UT |
DS2703 SHA-1 Battery Pack Authentication IC
14 of 20
I/O SIGNALING
The 1-Wire bus requires strict signaling protocols to ensure data integrity. The four protocols used by the DS2703
are as follows: the initialization sequence (reset pulse followed by presence pulse), write 0, write 1, and read data.
The bus master initiates all these types of signaling except the presence pulse.
The initialization sequence required to begin any communication with the DS2703 is shown in Figure 7. A presence
pulse following a reset pulse indicates that the DS2703 is ready to accept a net address command. The bus master
transmits (Tx) a reset pulse for t
RSTL
. The bus master then releases the line and goes into receive mode (Rx). The
1-Wire bus line is then pulled high by the pullup resistor. After detecting the rising edge on the DQ pin, the DS2703
waits for t
PDH
and then transmits the presence pulse for t
PDL
.
Figure 7. 1-Wire Initialization Sequence
WRITE-TIME SLOTS
A write-time slot is initiated when the bus master pulls the 1-Wire bus from a logic-high (inactive) level to a logic-low
level. There are two types of write-time slots: write 1 and write 0. All write-time slots must be t
SLOT
in duration with
a 1 s minimum recovery time, t
REC
, between cycles. The DS2703 samples the 1-Wire bus line between t
LOW1_MAX
and t
LOW0_MIN
after the line falls. If the line is high when sampled, a write 1 occurs. If the line is low when sampled, a
write 0 occurs. The sample window is illustrated in Figure 8. 1-Wire Write and Read Time
Slots. For the bus master
to generate a write 1 time slot, the bus line must be pulled low and then released, allowing the line to be pulled high
less than t
RDV
after the start of the write time slot. For the host to generate a write 0 time slot, the bus line must be
pulled low and held low for the duration of the write-time slot.
Caution
: When communicating in standard mode, the number of consecutive Write 0 time slots with t
LOW0
=
t
LOW0_MAX
and t
REC
= t
REC_MIN
is limited to 64. If more than 64 Write 0 time slots with t
LOW0
= t
LOW0_MAX
and t
REC
=
t
REC_MIN
are issued, the internal supply (V
DD_INT
) can drop so low that the DS2703 resets. Increasing t
REC
to 5 s
allows Vdd_int to recharge sufficiently each time slot.
READ-TIME SLOTS
A read-time slot is initiated when the bus master pulls the 1-Wire bus line from a logic-high level to a logic-low level.
The bus master must keep the bus line low for at least 1 s and then release it to allow the DS2703 to present valid
data. The bus master can then sample the data t
RDV
from the start of the read-time slot. By the end of the read-
time slot, the DS2703 releases the bus line and allows it to be pulled high by the external pullup resistor. All read-
time slots must be t
SLOT
in duration with a 1 s minimum recovery time, t
REC
, between cycles. See Figure 8 and the
timing specifications in the Electrical Characteristics table for more information.
t
RSTL
t
PDL
t
RSTH
t
PDH
V
PULLUP
GND-
LINE TYPE LEGEND:
BUS MASTER ACTIVE LOW
DS2703 ACTIVE LOW
RESISTOR PULLUP
BOTH BUS MASTER AND
DS2703 ACTIVE LOW
DQ
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2704 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1280-Bit EEPROM with SHA-1 Authentication |
| DS2704-500-WAFER | 功能描述:电可擦除可编程只读存储器 RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2704E+ | 制造商:Maxim Integrated Products 功能描述:1024 BIT MEM W/SHA-1 AUTH L/F - Rail/Tube |
| DS2704G+ | 功能描述:电可擦除可编程只读存储器 1280-Bit 电可擦除可编程只读存储器 w/SHA-1 Authent RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 |
| DS2704G+T&R | 制造商:Maxim Integrated Products 功能描述:EEPROM SERL-1WIRE 1.25KBIT 5PAGES X 32 3.3V/5V 6TDFN EP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC EEPROM 1.25KBIT 6TDFN 制造商:Maxim Integrated Products 功能描述:EEPROM 1280-Bit EEPROM w/SHA-1 Authent |
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