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參數(shù)資料
| 型號： | DS1344E-18+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC SPI 1.8V 20TSSOP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 74 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，閏年，NVRAM，方波輸出，涓流充電器 |
| 存儲容量： | 96B |
| 時間格式： | HH:MM:SS（12/24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | SPI |
| 電源電壓： | 1.71 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 20-TSSOP |
| 包裝： | 管件 |
15
Maxim Integrated
Low-Current SPI/3-Wire RTCs
DS1343/DS1344
Assume, for the purposes of the example, that a system
power supply of 5V is applied to VCC and a super cap is
connected to VBAT. Also assume that the trickle charger
has been enabled with one diode and resistor R1. The
maximum current IMAX would be calculated as follows:
IMAX = (5.0V - diode drop)/R1 ≈ (5.0V - 0.6V)/2k ≈
2.2mA
As the super cap charges, the voltage drop between
VCC and VBAT decreases, and therefore, the charge
current decreases.
Serial Port Operation
The devices offer the flexibility to choose between two
serial-interface modes. The component can commu-
nicate with the SPI interface or with a standard 3-wire
interface. The interface method used is determined by
SERMODE. When SERMODE is connected to VCC, SPI
communication is selected. When SERMODE is con-
nected to ground, standard 3-wire communication is
selected.
Figure 2. Trickle Charger Block Diagram
Table 3. Trickle-Charger Resistor and Diode Select
X = Don’t care.
R1
1k
R2
2k
R3
4k
VCC
VBAT
1 0F 18 SELECT
NOTE: ONLY 1010 CODE ENABLES CHARGER
1 OF 2
SELECT
1 OF 3
SELECT
TCS = TRICKLE-CHARGER SELECT
DS = DIODE SELECT
RS = RESISTOR SELECT
TRICKLE
CHARGER
REGISTER
TCS
BIT 7
TCS
BIT 6
TCS
BIT 5
TCS
BIT 4
DS
BIT 3
DS
BIT 2
RS
BIT 1
RS
BIT 0
TCS3
TCS2
TCS1
TCS0
DS1
DS0
RS1
RS0
FUNCTION
X
0
Disabled
X
0
X
Disabled
X
1
X
Disabled
1
0
1
0
1
0
1
No diode, 1kI
1
0
1
0
1
0
No diode, 2kI
1
0
1
0
1
No diode, 4kI
1
0
1
0
1
0
1
One diode, 1kI
1
0
1
0
1
0
1
0
One diode, 2kI
1
0
1
0
1
0
1
One diode, 4kI
0
Initial power-on state—disabled
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| DS1344E-18+ | 功能描述:實時時鐘 Low-Current SPI/3-Wire RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1344E-18+T&R | 制造商:Maxim Integrated Products 功能描述:SPI RTC 20P TSSOP 1.8V 12.5PF A T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC SPI 1.8V 20TSSOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock Low-Current SPI/3-Wire RTC |
| DS1344E-18+T&R | 功能描述:實時時鐘 Low-Current SPI/3-Wire RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1344E-3+ | 功能描述:實時時鐘 Low-Current SPI/3-Wire RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1344E-3+T&R | 制造商:Maxim Integrated Products 功能描述:SPI RTC 20P TSSOP 3V 12.5PF AM T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC SPI 3.0V 20TSSOP |
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