- 您现在的位置：买卖IC网 > PDF目录98051 > PCA8802CX8/B/1 (NXP SEMICONDUCTORS) SPECIALTY ANALOG CIRCUIT, PBGA8 PDF资料下载
参数资料
| 型号： | PCA8802CX8/B/1 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA8 |
| 封装： | 1.19 X 1.14 MM, 0.29 MM HEIGHT, LEAD FREE, WLCSP-8 |
| 文件页数： | 31/34页 |
| 文件大小： | 160K |
| 代理商： | PCA8802CX8/B/1 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页当前第31页第32页第33页第34页
PCA8802_1
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 19 February 2009
6 of 34
NXP Semiconductors
PCA8802
Smartcard RTC
9.1.2 Low power operation
With the power-down instruction (pwd_cmd) the oscillator can be stopped and the device
can be put into a low power state where power consumption is reduced to an absolute
minimum. The chip would normally reset when the oscillator is stopped, so to prevent a
reset of the chip during this state, a special software power-down sequence must be used
(see Table 7). In power-down state, the interface is still accessible.
A prime consideration for low power consumption is the series resistance Rs of the quartz
used. The series resistance acts as a loss element. Low Rs will reduce current
consumption further.
9.2 Divider
The divider chain is responsible for reducing the 32.768 kHz oscillator frequency down to
1
32 Hz.
The dividers (see Figure 7) divider_2 and divider_3 may be reset with the dvs_cmd
instruction. The 24 bit counter may be set when the dividers are held in reset, but this is
not a requirement. This allows for accurate setting and restarting of the counter.
The interface is asynchronous to the quartz oscillator and the state of divider_1 can not be
known when the dvs_cmd is enabled. The 8.192 kHz clock could have just occurred and
hence a delay of 1
8192 seconds will occur before the next increment of the divider_2, or
the 8.192 kHz clock could be just about to occur and immediately increment the divider_2.
As a consequence, an uncertainty of between zero and one 8192 Hz clock period (i.e. a
time uncertainty of about 0 s to 122
s) will be present when restarting the counter.
VDD =3V.
Fig 6.
IDD with respect to Rs
Quartz series resistance, Rs (k
)
0
100
80
40
60
20
001aaj165
130
170
90
210
250
IDD
(nA)
50
相关PDF资料 |
PDF描述 |
|---|---|
| PCA8802U/2AA/1 | SPECIALTY ANALOG CIRCUIT, PBGA8 |
| PCF1252-9TD-T | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| PCF1252-4TD-T | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| PCF50603HN | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC48 |
| PCF8591T-T | SPECIALTY ANALOG CIRCUIT, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PCA8802U | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:ultra low power oscillator with integrated counter for initiating one time password generation |
| PCA8802U/12AA/1,00 | 功能描述:实时时钟 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 |
| PCA8802U/2AA/1,026 | 功能描述:实时时钟 ultra LOW POWER OSC Smartcard RTC 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 |
| PCA8802UG/12KB/1,0 | 制造商:NXP Semiconductors 功能描述:PCA8802UG/UNCASED/FOIL//12KB/1 - Gel-pak, waffle pack, wafer, diced wafer on film 制造商:NXP Semiconductors 功能描述:IC SMARTCARD RTC ULP OSC 8WLCSP |
| PCA887A/CW/DP1S | 制造商:Rochester Electronics LLC 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: 制造商:ZARLINK 功能描述: |
发布紧急采购，3分钟左右您将得到回复。