參數(shù)資料
型號(hào)： BQ3285ESSNTR
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： SSOP-24
文件頁(yè)數(shù)： 36/37頁(yè)
文件大?。?/td> 1438K
代理商： BQ3285ESSNTR
Power-Down/Power-Up Cycle
The bq3285E and bq3285L power-up/power-down cycles are
different. The bq3285L continuously monitors VCC for out-of-
tolerance. During a power failure, when VCC falls below VPFD
(2.53V typical), the bq3285L write-protects the clock and stor-
age registers. The power source is switched to BC when VCC is
less than VPFD and BC is greater than VPFD, or when VCC is
less than VBC and VBC is less than VPFD. RTC operation and
storage data are sustained by a valid backup energy source.
When VCC is above VPFD, the power source is VCC. Write-
protection continues for tCSR time after VCC rises above VPFD.
The bq3285E continuously monitors VCC for out-of-tolerance.
During a power failure, when VCC falls below VPFD (4.17V
typical), the bq3285E write-protects the clock and storage
registers. When VCC is below VBC (3V typical), 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 contin-
ues for tCSR time after VCC rises above VPFD.
Control/Status Registers
The four control/status registers of the bq3285E/L are
accessible regardless of the status of the update cycle
(see Table 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 011 behaves as 010 but additionally
transforms register C into a read/write register. This al-
lows the 32.768kHz output on the square wave pin to be
turned on. 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
Register A Bits
76543210
UIP
OS2
OS1
OS0
RS3
RS2
RS1
RS0
76543210
----
RS3
RS2
RS1
RS0
76543210
-
OS2
OS1
OS0
----
76543210
UIP
-------
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
2
INTF
0
PF
0
AF
0
UF
0
-
0
32KE na
-
0
-
0
D
0D
Yes
No
VRT
na
-0-0-
0
-
0-0-0
-
0
Notes:
na = not affected.
1. Except bit 7.
2. Read/write only when OSC2–OSC0 in register A is 011 (binary).
Table 4. Control/Status Registers
bq3285E/L
相關(guān)PDF資料
PDF描述
BQ3285ESS-N 1 TIMER(S), REAL TIME CLOCK, PDSO24
BQ3285ESSN 1 TIMER(S), REAL TIME CLOCK, PDSO24
BQ3285LCSS 1 TIMER(S), REAL TIME CLOCK, PDSO24
BQ3285ECSS 1 TIMER(S), REAL TIME CLOCK, PDSO24
BQ4285Q 1 TIMER(S), REAL TIME CLOCK, PQCC28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BQ3285ESSTR 功能描述:實(shí)時(shí)時(shí)鐘 w/242x8 NVSRAM Alarm Wake-up 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
BQ3285ESS-TR1 制造商:Rochester Electronics LLC 功能描述:- Bulk
BQ3285ESSTRG4 功能描述:實(shí)時(shí)時(shí)鐘 w/242x8 NVSRAM Alarm Wake-up 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
BQ3285ESTR 功能描述:實(shí)時(shí)時(shí)鐘 w/242x8 NVSRAM Alarm Wake-up 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
BQ3285ESTRG4 功能描述:實(shí)時(shí)時(shí)鐘 w/242x8 NVSRAM Alarm Wake-up 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
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