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参数资料
| 型号： | DS1394U-33+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/26页 |
| 文件大小： | 0K |
| 描述： | IC RTC SPI 3WIRE W/CHRGR 10-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，涓流充电器 |
| 时间格式： | HH:MM:SS:hh（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | SPI |
| 电源电压： | 2.97 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
19
Maxim Integrated
The user determines diode and resistor selection
according to the maximum current desired for battery
or super cap charging. The maximum charging current
can be calculated as illustrated in the following exam-
ple. Assume that a system power supply of 3.3V is
applied to VCC and a super cap is connected to
VBACKUP. Also, assume that the trickle charger has
been enabled with a diode and resistor R2 between
VCC and VBACKUP. The maximum current IMAX would
therefore be calculated as follows:
IMAX = (3.3V - diode drop) / R2
≈ (3.3V - 0.7V) /
2k
≈ 1.3mA
As the super cap changes, the voltage drop between
VCC and VBACKUP decreases and therefore the charge
current decreases.
R1
250
R2
2k
R3
4k
VCC
VBACKUP
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TCS3
TCS2
TCS1
TCS0
DS1
DS0
ROUT1
ROUT0
TRICKLE-CHARGE REGISTER (8Fh WRITE, 0Fh READ)
1 0F 16 SELECT
NOTE: ONLY 1010b ENABLES CHARGER
1 OF 2
SELECT
1 OF 3
SELECT
TCS[3:0] = TRICKLE-CHARGE SELECT
DS[1:0] = DIODE SELECT
ROUT[1:0] = RESISTOR SELECT
Figure 8. DS1390–DS1394 Programmable Trickle Charger
MODE
CPHA
CS
SCLK
SDI
SDO
Disable
X
High
Input Disabled
High-Z
Write
0
Low
CPOL* = 0, SCLK Rising;
CPOL = 1, SCLK Falling
Data Bit Latch
High-Z
Read
0
Low
CPOL = 0, SCLK Falling;
CPOL = 1, SCLK Rising
X
Next Data Bit Shift**
Write
1
Low
CPOL* = 1, SCLK Rising;
CPOL = 0, SCLK Falling
Data Bit Latch
High-Z
Read
1
Low
CPOL = 1, SCLK Falling;
CPOL = 0, SCLK Rising
X
Next Data Bit Shift**
Table 6. SPI Pin Function
*
CPOL is the clock-polarity bit set in the control register of the host microprocessor.
**
SDO remains at high-Z until 8 bits of data are ready to be shifted out during a read.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1394U-33+ | 功能描述:实时时钟 Low-V SPI/3-Wire With Trickle Charger 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 |
| DS1394U-33+T&R | 制造商:Maxim Integrated Products 功能描述:SERIAL SPI RTC 3.3V USOP PB-FREE TR - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC SPI 3WIRE W/CHRGR 10-MSOP |
| DS1394U-33+T&R | 功能描述:实时时钟 Low-V SPI/3-Wire With Trickle Charger 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 |
| DS1395 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:RAMified Real Time Clock |
| DS1395N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Peripheral IC |
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