參數(shù)資料
型號(hào)： BQ3285S
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： XO, clock
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO24
封裝： 0.300 INCH, PLASTIC, SOIC-24
文件頁(yè)數(shù)： 25/26頁(yè)
文件大?。?/td> 676K
代理商： BQ3285S
Power-Down/Power-Up Cycle
The bq3285 continuously monitors VCC for out-of-
tolerance. During a power failure, when VCC falls below
VPFD (4.17V typical), the bq3285 write-protects the clock
and storage registers. When VCC is below VBC (3V typi-
cal), the power source is switched to BC. RTC operation
and storage data are sustained by a valid backup energy
source. When VCC is above VBC, the power source is VCC.
Write-protection continues for tCSR time after VCC rises
above VPFD.
Control/Status Registers
The four control/status registers of the bq3285 are acces-
sible regardless of the status of the update cycle (see Ta-
ble 4).
Register A
Register A programs:
n
The frequency of the square-wave and the periodic
event rate.
n
Oscillator operation.
Register A provides:
n
Status of the update cycle.
RS0–RS3 - Frequency Select
These bits select one of the 13 frequencies for the SQW out-
put and the periodic interrupt rate, as shown in Table 3.
OS0–OS2 - Oscillator Control
These three bits control the state of the oscillator and
divider stages. A pattern of 010 enables RTC operation
by turning on the oscillator and enabling the frequency
divider. A pattern of 11X turns the oscillator on, but
keeps the frequency divider disabled. When 010 is writ-
ten, the RTC begins its first update after 500ms.
UIP - Update Cycle Status
This read-only bit is set prior to the update cycle. When
UIP equals 1, an RTC update cycle may be in progress.
UIP is cleared at the end of each update cycle. This bit
is also cleared when the update transfer inhibit (UTI)
bit in register B is 1.
8
Reg.
Loc.
(Hex) Read Write
Bit Name and State on Reset
7 (MSB)
6
5
4
3
2
1
0 (LSB)
A
0A
Yes
1
UIP
na
OS2
na
OS1
na
OS0
na
RS3
na
RS2
na
RS1
na
RS0
na
B
0B
Yes
UTI
na
PIE
0
AIE
0
UIE
0
SQWE
0
DF
na
HF
na
DSE na
C
0C
Yes
No
INTF
0
PF
0
AF
0
UF
0
-
0-0-0
-
0
D
0D
Yes
No
VRT
na
-0-0-0
-
0-0-0
-
0
Notes:
1.
Except bit 7.
2.
na = not affected
Table 4. Control/Status Registers
Register A Bits
7654
3
210
UIP
OS2
OS1
OS0
RS3
RS2
RS1
RS0
76543210
----
RS3
RS2
RS1
RS0
76543210
-
OS2
OS1
OS0
----
76543210
UIP
-------
bq3285
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BQ3285S- 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Real-Time Clock RTC
BQ3285S-SB2 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC with 114x8 NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)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
BQ3285S-SB2G4 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC with 114x8 NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)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
BQ3285S-SB2TR 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC with 114x8 NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)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
BQ3285S-SB2TRG4 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC with 114x8 NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)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
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