參數(shù)資料
型號： PCA9665N
廠商： NXP SEMICONDUCTORS
元件分類： 總線控制器
英文描述： Fm+ parallel bus to I2C-bus controller
中文描述： I2C BUS CONTROLLER, PDIP20
封裝： 0.300 INCH, PLASTIC, MS-001, SOT146-1, DIP-20
文件頁數(shù)： 15/91頁
文件大?。?/td> 372K
代理商： PCA9665N
PCA9665_2
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 7 December 2006
15 of 91
NXP Semiconductors
PCA9665
Fm+ parallel bus to I
2
C-bus controller
7.3.2.6
The I
2
C-bus mode register, I2CMODE (indirect address 06h)
I2CMODE is an 8-bit read/write register. It contains the control bits that select the correct
timing parameters when the device is used in master mode (AC[1:0]). Timing parameters
involved with AC[1:0] are t
BUF
, t
HD;STA
, t
SU;STA
, t
SU;STO
, t
HIGH
, t
LOW
.
Remark:
Change from an I
2
C-bus mode to a slower one (Fast-mode to Standard-mode,
for example) will cause the HIGH and LOW timings of SCL to be violated. It is then
required to program the I2CSCLL and I2CSCLH registers with values in accordance with
the selected mode.
[1]
I2CSCLL and I2CSCLH values in the table also represents the minimum values that can be used for the
corresponding I
2
C-bus mode. Use of lower values will cause the minimum values to be loaded.
[2]
Using the formula
Table 23.
I2CMODE - I
2
C-bus Mode register (indirect address 06h) bit allocation
6
5
4
-
-
-
7
-
3
-
2
-
1
0
AC1
AC0
Table 24.
Bit
7:2
I2CMODE - I
2
C-bus Mode register (indirect address 06h) bit description
Symbol
Description
-
Reserved. When I2CMODE is read, zeroes are read. Must be written
with zeroes.
AC[1:0]
I
2
C-bus mode selection to ensure proper timing parameters (see
Table 25
).
AC[1:0] = 00: Standard-mode AC parameters selected.
AC[1:0] = 01: Fast-mode AC parameters selected.
AC[1:0] = 10: Fast-mode Plus AC parameters selected.
AC[1:0] = 11: Turbo mode. In this mode, the user is not limited to a
maximum frequency of 1 MHz.
1:0
Table 25.
I2CSCLL
(hexadecimal)
9D
2C
11
0E
I
2
C-bus mode selection example
[1]
I2CSCLH
(hexadecimal)
86
14
09
05
I
2
C-bus frequency
(kHz)
[2]
99.9
396.8
952.3
AC[1:0]
Mode
00
01
10
11
Standard
Fast
Fast-mode Plus
Turbo mode
f
SCL
I2CSCLH
T
osc
I2CSCLL
+
t
r
t
f
+
+
----------------------------------------------------------------------------------------------
=
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