- 您现在的位置：买卖IC网 > PDF目录1994 > DS1670S (Maxim Integrated Products)IC CTRLR SYSTEM PORTABLE 20-SOIC PDF资料下载
参数资料
| 型号： | DS1670S |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR SYSTEM PORTABLE 20-SOIC |
| 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 |
DS1670
8 of 16
switch by pulling the RST line low. After the internal 250ms timer has expired, the DS1670 will continue
to monitor the RST line. If the line is still low, the DS1670 will continue to monitor the line looking for a
rising edge. Upon detecting release, the DS1670 will force the RST line low and hold it low for 250ms.
The third microprocessor monitoring function provided by the DS1670 is a watchdog timer. The
watchdog timer function forces RST to the active state when the ST input is not stimulated within the
predetermined time period. The time period is set by the Time Delay (TD) bits in the Watchdog Register.
The time delay can be set to 250ms, 500ms, or 1000ms (see Figure 5). If TD0 and TD1 are both set to 0,
the watchdog timer is disabled. When enabled, the watchdog timer starts timing out from the set time
period as soon as RST is inactive. The default setting is for the watchdog timer to be enabled with
1000ms time delay. If a high-to-low transition occurs on the ST input pin prior to timeout, the watchdog
timer is reset and begins to time-out again. If the watchdog timer is allowed to timeout, then the RST
signal is driven to the active state for 250ms (typical). The ST input can be derived from microprocessor
address signals, data signals, and/or control signals. To guarantee that the watchdog timer does not
timeout, a high-to-low transition must occur at or less than the minimum period.
WATCHDOG TIMEOUT CONTROL Figure 5
WATCHDOG REGISTER
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
TD1
TD0
WATCHDOG TIMEOUT
TD1
TD0
WATCHDOG TIMEOUT
0
Watchdog disabled
0
1
250ms
1
0
500ms
1
1000ms
ANALOG-TO-DIGITAL CONVERTER
The DS1670 provides a 3-channel, 8-bit analog-to-digital converter. The ADC reference voltage (2.55V
typical) is derived from an on-chip band-gap circuit. Three multiplexed analog inputs are provided
through the AIN0, AIN1, and AIN2 pins. The ADC is monotonic (no missing codes) and uses a
successive approximation technique to convert the analog signal into a digital code. An A/D conversion is
the process of assigning a digital code to an analog input voltage. This code represents the input value as
a fraction of the full-scale voltage (FSV) range. Thus, the FSV range is then divided by the ADC into 256
codes (8 bits). The FSV range is bounded by an upper limit equal to the reference voltage and the lower
limit, which is ground. The DS1670 has a FSV of 2.55V (typical) that provides a resolution of 10mV. An
input voltage equal to the reference voltage converts to FFh while an input voltage equal to ground
converts to 00h. The relative linearity of the ADC is ±0.5 LSB.
The ADC selects from one of three different analog inputs (AIN0–AIN2). The input that is selected is
determined by the Analog Input Select (AIS) bits in the Control Register. Table 2 lists the specific analog
相关PDF资料 |
PDF描述 |
|---|---|
| DS1672S-3/T&R | IC TIMEKEEPER 3V 32-BIT 8-SOIC |
| DS1673S-3 | IC CTRLR SYSTEM PORT 3V 20-SOIC |
| DS1677E | IC CTRLR SYSTEM PORT 20-TSSOP |
| DS1678S/T&R | IC RECORDER REALTIME EVENT 8SOIC |
| DS1682S | IC TIMEKEEPER ALARM ELAPSE 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。