OM6271 NXP Semiconductors, OM6271 Datasheet - Page 10

• Manufacturer Part Number: OM6271
• Description: Interface Modules & Development Tools SPI to I2C Master Bridge Demoboard
• Manufacturer: NXP Semiconductors

Specifications of OM6271

• Interface Type: I2C, SPI
• Data Bus Width: 8 bit
• For Use With/related Products: SC18IS601IPW
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
SC18IS600_601_5
Product data sheet
6.2.5 I
The I
Table 6.
The time-out register is used to determine the maximum time that the I
allowed to complete a transfer before setting an I
Table 7.
The least significant bit of I2CTO (TE bit) is used as a time-out enable/disable. A logic 1
will enable the time-out function.
On the SC18IS600 the time-out oscillator operates at 57.6 kHz. For the SC18IS601 the
time-out oscillator frequency can be determined using
This oscillator is fed into a 16-bit down counter. The down counter’s lower nine bits are
loaded with ‘1’, while the upper seven bits are loaded with the contents of I2CTO.
The time-out value is an approximate value.
In the case of arbitration loss, the SC18IS600/601 will transmit a START condition when
the bus becomes free unless the time-out condition is reached. If the time-out condition is
reached, an interrupt will be generated on the INT pin. The ‘I
be read in I2CStat.
I
Time-out oscillator frequency
I2CClk (decimal)
5 (minimum)
7
9
19
255 (maximum)
Bit
7:1
0
2
2
Fig 10. Time-out value
C-bus time-out register (I2CTO)
C-bus clock frequency
2
C-bus clock frequency for the SC18IS601 can be determined using
Symbol
TO[7:1]
TE
I
I2CTO - I
2
C-bus clock frequency example at 7.3728 MHz
2
C-bus time-out register (address 0x04) bit description
I
369 kHz
263 kHz
204 kHz
97 kHz
7.2 kHz
2
C-bus clock frequency
OSCILLATOR
Rev. 05 — 28 July 2008
57.6 kHz
Description
Time-out value
Enable/disable time-out function
=
logic 0 = disable
logic 1 = enable
---------------------------- Hz
4
CLKIN
=
I 2CClk
CLKIN
------------------ - Hz
128
16-BIT DOWN COUNTER
[I2CTO][111111111]
2
C-bus time-out interrupt.
002aab715
Equation
SC18IS600/601
2
C-bus time-out’ status can
time-out
3:
SPI to I
2
© NXP B.V. 2008. All rights reserved.
C-bus master is
2
C-bus interface
Equation
10 of 30
2:
(2)
(3)