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參數(shù)資料
| 型號(hào)： | PCA8802U/2AA/1 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA8 |
| 封裝： | 1.19 X 1.14 MM, 0.22 MM HEIGHT, LEAD FREE, WLCSP-8 |
| 文件頁(yè)數(shù)： | 30/34頁(yè) |
| 文件大?。?/td> | 160K |
| 代理商： | PCA8802U/2AA/1 |
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PCA8802_1
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 19 February 2009
5 of 34
NXP Semiconductors
PCA8802
Smartcard RTC
9.
Functional description
The PCA8802 is an ultra low power device for battery operations. The integrated oscillator
circuit generates a 1
32 Hz clock signal to increment a 24 bit counter. The communication
between the PCA8802 and other devices is made via an I2C-bus.
The device is always running but for longer storage time it can be switched off and on
again in case of delivery.
The functions of the device can be controlled with the following instruction set:
9.1 Oscillator
The 32.768 kHz oscillator includes two integrated load capacitors and an automatic gain
control to ensure a reliable start-up.
For prototype development and system debugging, it is possible to output a 32.768 kHz
square wave on the INT pin with the 32k_cmd instruction.
9.1.1 Power-on
At initial power-on, when the oscillator has not yet started, a reset will be generated.
During this state the serial interface will not respond when accessed. To ensure that the
oscillator has started and the serial interface is accessible, it is recommended that the
master attempts to make write-read accesses to the counter register.
Table 4.
Instruction set overview
Instruction
Description
Reference
wrt_cmd
device write access
dvs_cmd
divider start or stop switch
pwd_cmd
low power mode switch
32k_cmd
32.768 kHz clock signal on the pin INT switch
fst_cmd
fast system development mode switch
set_cmd
set counter instruction
rd_cmd
counter read instruction
Exit from Power-down mode will give the same behavior as start-up.
Fig 5.
Power-on reset
001aaj166
oscillation now stable
oscillation
instructions will be ignored
VDD
instructions will be accepted
t
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| 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 |
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