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參數(shù)資料
| 型號(hào)： | BQ4285Q |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | XO, clock |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁(yè)數(shù)： | 26/26頁(yè) |
| 文件大小： | 1079K |
| 代理商： | BQ4285Q |
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9
Control/Status Registers
The four control/status registers of the bq4285 are acces-
sible regardless of the status of the update cycle (see Ta-
ble 4).
Register A
Register A Bits
76543210
UIP
OS2
OS1
OS0
RS3
RS2
RS1
RS0
Register A programs:
s
The frequency of the square-wave and the periodic
event rate.
s
Oscillator operation.
Register A provides:
s
Status of the update cycle.
RS0–RS3 - Frequency Select
76543210
----
RS3
RS2
RS1
RS0
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
76543210
-
OS2
OS1
OS0
----
These three bits control the state of the oscillator and di-
vider stages. A pattern of 010 enables RTC operation by
turning on the oscillator and enabling the frequency di-
vider. A pattern of 11X turns the oscillator on, but keeps
the frequency divider disabled.
When 010 is written,
the RTC begins its first update after 500ms.
UIP - Update Cycle Status
76543210
UIP
-------
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.
Register B
Register B Bits
7654
3
210
UTI
PIE
AIE
UIE SQWE
DF
HF
DSE
Register B enables:
s
Update cycle transfer operation
s
Square-wave output
s
Interrupt events
s
Daylight saving adjustment
Register B selects:
s
Clock and calendar data formats
All bits of register B are read/write.
Jan. 1999 D
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:
na = not affected.
1. Except bit 7.
Table 4. Control/Status Registers
bq4285
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ4285Q- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC With NVRAM Control |
| BQ4285S- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Real-Time Clock RTC With NVRAM Control |
| BQ4285S-SB2 | 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control 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 |
| BQ4285S-SB2G4 | 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control 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 |
| BQ4285S-SB2TR | 功能描述:實(shí)時(shí)時(shí)鐘 RTC IC: 114x8 NVSRAM & NVSRAM Control 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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