參數(shù)資料
型號(hào)： DS17485
廠商： Maxim Integrated Products, Inc.
英文描述： 3 Volt/5 Volt Real Time Clock(3V/5V實(shí)時(shí)時(shí)鐘)
文件頁(yè)數(shù)： 10/32頁(yè)
文件大小： 236K
代理商： DS17485
DS17485/DS17487
030598 10/32
The third method uses a periodic interrupt to determine
if an update cycle is in progress. The UIP bit in Register
A is set high between the setting of the PF bit in Register
C (see Figure 3). Periodic interrupts that occur at a rate
of greater than t
BUC
allow valid time and date informa-
tion to be reached at each occurrence of the periodic
interrupt. The reads should be complete within
(t
PI
/ 2+t
BUC
) to ensure that data is not read during the
update cycle.
UPDATE–ENDED AND PERIODIC INTERRUPT RELATIONSHIP
Figure 3
t
BUC
t
PI/2
t
PI/2
t
PI
UIP BIT IN
REGISTER A
UF BIT IN
REGISTER C
PF BIT IN
REGISTER C
t
PI
= PERIODIC INTERRUPT TIME INTERNAL PER TABLE 1
t
BUC
= DELAY TIME BEFORE UPDATE CYCLE = 244
μ
s
REGISTER A
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
UIP
DV2
DV1
DV0
RS3
RS2
RS1
RS0
UIP
–
The Update In Progress (UIP) bit is a status flag
that can be monitored. When the UIP bit is a one, the
update transfer will soon occur. When UIP is a zero, the
update transfer will not occur for at least 244
μ
s. The
time, calendar, and alarm information in RAM is fully
available for access when the UIP bit is zero. The UIP
bit is read only. Writing the SET bit in Register B to a one
inhibits any update transfer and clears the UIP status
bit.
DV2, DV1, DV0 –
These bits are defined as follows:
DV2 =
Countdown Chain
1 –resets countdown chain only if DV1=1
0 –countdown chain enabled
Oscillator Enable
0 –oscillator off
1 –oscillator on, V
CC
power–up state
Bank Select
0 –original bank
1 –extended registers
DV1 =
DV0 =
A pattern of 01X is the only combination of bits that will
turn the oscillator on and allow the RTC to keep time. A
pattern of 11X will enable the oscillator but holds the
countdown chain in reset. The next update will occur at
500 ms after a pattern of 01X is written to DV2, DV1, and
DV0.
RS3, RS2, RS1, RS0 –
These four rate–selection bits
select one of the 13 taps on the 15–stage divider or dis-
able the divider output. The tap selected can be used to
generate an output square wave (SQW pin) and/or a
periodic interrupt. The user can do one of the following
Enable the interrupt with the PIE bit;
Enable the SQW output pin with the SQWE or E32K
bits;
Enable both at the same time and the same rate; or
Enable neither.
Table 2 lists the periodic interrupt rates and the square
wave frequencies that can be chosen with the RS bits.
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DS17485-3 功能描述:實(shí)時(shí)時(shí)鐘 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS17485-3+ 功能描述:實(shí)時(shí)時(shí)鐘 3V/5V 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS17485-5 功能描述:實(shí)時(shí)時(shí)鐘 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS17485-5+ 功能描述:實(shí)時(shí)時(shí)鐘 3V/5V 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1748555 制造商:Maxim Integrated Products 功能描述:
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