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| 型号： | DS1670S+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR SYSTEM PORTABLE 20SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 37 |
| 类型： | 便携系统控制器 |
| 特点： | 警报器，闰年，监视计时器 |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 3 线串口 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电压 - 电源，电池： | 2.5 V ~ 3.7 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 管件 |
| 产品目录页面： | 1434 (CN2011-ZH PDF) |
DS1670
7 of 16
The DS1670 nonvolatilizes the external SRAM(s) by write protecting the SRAM(s) and by providing a
back-up power supply in the absence of VCC. When VCC falls below 2.88V (typical), access to the
external SRAM(s) are prohibited by forcing CEOL and CEOH high regardless of the level of CEI , BLE ,
and BHE . Also at this point, the SRAM power supply (VCCO) is switched from VCC to VBAT. Upon power-
up, access is prohibited until the end of tRPU.
EXTERNAL SRAM CHIP ENABLE Table 3
CEI
BHE
BLE
CEOL
CEOH
FUNCTION
0
Word Transfer
0
1
0
Byte Transfer in upper half of data bus (D15-D8)
0
1
0
1
Byte Transfer in lower half of data bus (D7-D0)
0
1
External SRAMs disabled
1
X
1
External SRAMs disabled
EXTERNAL SRAM INTERFACE (WORD-WIDE) TO THE DS1670 Figure 4
MICROPROCESSOR MONITOR
The DS1670 monitors three vital conditions for a microprocessor: power supply, software execution, and
external override.
First, a precision temperature-compensated reference and comparator circuit monitors the status of VCC.
When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces the
RST
pin to the active state, thus warning a processor-based system of impending power failure. The
power-fail trip point is 2.88V (typical). When VCC returns to an in-tolerance condition upon power-up,
the reset signal is kept in the active state for 250ms (typical) to allow the power supply and
microprocessor to stabilize. Note, however, that if the EOSC bit is set to a logic 1 (to disable the oscillator
during battery-backup mode), the reset signal will be kept in an active state for 250ms plus the startup
time of the oscillator.
The second monitoring function is pushbutton reset control. The DS1670 provides for a pushbutton
switch to be connected to the RST output pin. When the DS1670 is not in a reset cycle, it continuously
monitors the RST signal for a low-going edge. If an edge is detected, the DS1670 will debounce the
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相关代理商/技术参数 |
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|---|---|
| DS1670S+ | 功能描述:实时时钟 Portable System Controller RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1671H | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Dual Clock Driver |
| DS1671J-8 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Dual Clock Driver |
| DS-1671ZJ | 制造商:Hikvision USA 功能描述:4" Indoor Ceiling Embedded Mount |
| DS1672 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Low Voltage Serial Timekeeping Chip |
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