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參數(shù)資料
| 型號： | PCA8802U/2AA/1 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號調(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 |
| 文件頁數(shù)： | 33/34頁 |
| 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
8 of 34
NXP Semiconductors
PCA8802
Smartcard RTC
9.4 Pulse generator
An interrupt pulse is available at the INT pin. This pulse is generated once every
32 seconds and could be used to wake up a microcontroller to perform a periodic function
e.g. to calculate and update an LCD display with a new one-time password.
A pulse is generated coincident with the increment of the counter. The new counter value
will be available immediately.
9.5 I2C-bus interface
9.5.1 Interface protocol
The serial interface is based on the I2C-bus protocol. The I2C-bus protocol has the
advantage of being robust in terms of immunity to electrical noise. Although the PCA8802
does not have the signal lters inside the interface pins, the slave address and
acknowledge hand shaking is nevertheless implemented.
For power saving, the SDA output is push-pull instead of the more traditional open-drain
output. Push-pull prevents the need for power consuming pull-up resistors, but does limit
the operation to point to point only.
The following slave addresses plus a write and read bit are reserved for the PCA8802:
write: 1010 0000
read: 1010 0001
An incorrect slave address will result in the device ignoring all bus data. A STOP or
START condition (see Section 9.5.4) will be required before a new transfer can be made.
9.5.1.1
The writing protocol
The writing protocol is shown in Figure 10.
There is no restriction for the order of sending instructions. As many instructions as
needed may be sent in one access. The total duration of one access must not exceed
32 seconds (see Figure 12).
Fig 9.
Pulse generator
001aaj169
INT
counter
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