SC18IS600(2006) View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
SC18IS600 Datasheet PDF : 28 Pages
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NXP Semiconductors
SC18IS600/601
SPI to I2C-bus interface
The I2C-bus clock frequency for the SC18IS601 can be determined using the following
formula:
I2C-bus clock frequency = 4-----×C-----LI--2-K---C--I--NC-----l--k-(Hz)
Table 6. I2C-bus clock frequency example at 7.3728 MHz
I2CClk (decimal) I2C-bus clock frequency
5 (minimum)
369 kHz
7
263 kHz
9
204 kHz
19
97 kHz
255 (maximum)
7.2 kHz
6.2.5 I2C-bus time-out register (I2CTO)
The time-out register is used to determine the maximum time that the I2C-bus master is
allowed to complete a transfer before setting an I2C-bus time-out interrupt.
Table 7.
Bit
7:1
0
I2CTO - I2C-bus time-out register (address 0x04) bit description
Symbol
Description
TO[7:1]
Time-out value
TE
Enable/disable time-out function
logic 0 = disable
logic 1 = enable
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 = C-----L-1---K2---8-I--N--- (Hz)
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.
57.6 kHz
OSCILLATOR
16-BIT DOWN COUNTER
[I2CTO][111111111]
002aab715
time-out
Fig 9. Time-out value
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 ‘I2C-bus time-out’ status can
be read in I2CStat.
SC18IS600_601_3
Product data sheet
Rev. 03 — 13 December 2006
© NXP B.V. 2006. All rights reserved.
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