SMD1108 Datasheet, PDF (8/29 Pages) Summit Microelectronics, Inc. – 8-Channel Auto-Monitor ADC In System Programmable Analog (ISPA) Device

SMD1108
Preliminary
SERIAL INTERFACE
The SMD1108 has an industry standard 2-wire serial
interface. It supports four (4) device-type addresses:
1010 for reading and writing the memory array; 1001 for
reading and writing the nonvolatile limit registers and
tR
tF
tHIGH
initiating ADC conversions; 1011 for access to the configu-
ration registers, and 0001 that is used for responses to the
SMB_ALERT protocol
In order to facilitate host system presence detection
techniques the SMD1108 provides A0, A1 and A2 address
inputs.
tLOW
SCL
tSU:SDA
SDA In
tHD:SDA
tHD:DAT
tSU:DAT
tSU:STO
tBUF
tAA
tDH
SDA Out
Figure 1. Memory Timing
Symbol
Parameter
f_SCL
t_LOW
t_HIGH
t_BUF
t_SU:STA
t_HD:STA
t_SU:STO
t
AA
t_DH
t_R
t_F
t_SU:DAT
t_HD:DAT
TI
SCL clock frequency
Clock low period
Clock high period
Bus free time (1)
Start condition setup time
Start condition hold time
Stop condition setup time
Clock edge to valid output
Data Out hold time (1)
SCL and SDA rise time (1)
SCL and SDA fall time (1)
Data In setup time (1)
Data In hold time (1)
Noise filter SCL and SDA (1)
t_WR
Write cycle time
Note (1) These values are guaranteed by design.
Conditions
Before new transmission
SCL low to valid SDA (cycle n)
SCL low (cycle n+1) to SDA change
Noise suppression
Table 2. Memory Timing
8
2052 2.0 10/05/01
2052 Fig01 1.0
Min.
0
4.7
4.0
4.7
4.7
4.0
4.7
0.3
0.3
250
0
Max. Units
100
kHz
µs
µs
µs
µs
µs
µs
3.5
µs
µs
1000
ns
300
ns
ns
ns
100
ns
5
ms
2052 Table02 1.0
SUMMIT MICROELECTRONICS, Inc.