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Functional Description
Figure 1 is a block diagram of the bq4847. The bq4847 is
functionally equivalent to the bq4845 except that the bat-
tery (20, 24) and crystal (2, 3) pins are not accessible. The
pins are connected internally to a coin cell and quartz
crystal. The coin cell provides 130mAh of capacity. It is in-
ternally isolated from VOUT and CEOUT until the initial
application of VCC. Once VCC rises above VPFD, this isola-
tion is broken, and the backup cell provides power to
VOUT and CEOUT for the external SRAM. The real-time
clock keeps time to within one minute per month at
room temperature. For a complete description of fea-
tures, operating conditions, electrical characteristics,
bus timing, and pin descriptions, see the bq4845 data
sheet. Valid part types for ordering are bq4847MT (5%)
and bq4847YMT (10%).
Figure 2 illustrates the address map for the bq4847. Ta-
ble 1 is a map of the bq4847 registers, and Table 2 de-
scribes the register bits.
2
Figure 1. Block Diagram
VCC
CS
OE
WE
CEOUT
VOUT
Mode
DQ
Power
<VCC (max.)
VIH
XX
CEIN
VOUT1
Deselect
High Z
Standby
VIL
XVIL
CEIN
VOUT1
Write
DIN
Active
>VCC (min.)
VIL
VIH
CEIN
VOUT1
Read
DOUT
Active
VIL
VIH
CEIN
VOUT1
Read
High Z
Active
<VPFD (min.) > VSO
XXX
VOH
VOUT1
Deselect
High Z
CMOS standby
≤ VSO
XXX
VOHB
VOUT2
Deselect
High Z
Battery-backup mode
Truth Table
bq4847/bq4847Y
Sept. 1996
Not Recommended For New Designs
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相关代理商/技术参数
BQ4847Y-MT 制造商:TI 制造商全称:Texas Instruments 功能描述:RTC Module With CPU Supervisor
BQ4850Y 制造商:TI 制造商全称:Texas Instruments 功能描述:RTC Module With 512Kx8 NVSRAM
BQ4850Y_13 制造商:TI 制造商全称:Texas Instruments 功能描述:RTC Module With 512Kx8 NVSRAM
BQ4850YMA-85 功能描述:实时时钟 RTC Module 512Kx8 NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
BQ4850YMA-85N 功能描述:实时时钟 RTC Mod With 512Kx8 NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
BQ4852Y 制造商:TI 制造商全称:Texas Instruments 功能描述:RTC Module With 512Kx8 NVSRAM
BQ4852YMC-85 功能描述:实时时钟 w/512Kx8 NVSRAM Watchdog Timer RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
BQ48S1.5-30A 制造商:未知厂家 制造商全称:未知厂家 功能描述:DC to DC Converter