SC18IS601 Philips Semiconductors, SC18IS601 Datasheet - Page 9

• Manufacturer Part Number: SC18IS601
• Description: (SC18IS600 / SC18IS601) SPI to IC-bus interface
• Manufacturer: Philips Semiconductors

NXP Semiconductors
SC18IS600_601_3
Product data sheet
6.2.5 I
I
The I
formula:
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 the following formula:
Time-out oscillator frequency
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.
I2CClk (decimal)
5 (minimum)
7
9
19
255 (maximum)
Bit
7:1
0
2
2
Fig 9. 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 the following
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
Rev. 03 — 13 December 2006
2
C-bus clock frequency
OSCILLATOR
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
SC18IS600/601
2
C-bus time-out’ status can
time-out
SPI to I
2
© NXP B.V. 2006. All rights reserved.
C-bus master is
2
C-bus interface
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