Philips Semiconductors
256 × 8-bit static low-voltage RAM with
I 2 C-bus interface
Product speci?cation
PCF8570
13.2
Slave address
The PCF8570 has a fixed combination 1 0 1 0 as group 1, while group 2 is fully programmable (see Fig.12).
1
handbook, halfpage
0
1
0
A2
A1
A0 R/W
group 1
group 2
MLB892
Fig.12 Slave address.
13.3
Power-saving mode
With the condition TEST = V DD or V DDR the PCF8570 goes into the power-saving mode and I 2 C-bus logic is reset.
handbook, full pagewidth
TEST
power saving
mode (1)
TEST = VDDR
operating mode
power saving
mode (2)
TEST = VDD
VDD
VDDR
0V
VDD
SCL
VDDR
0V
t SU (3)
t HD1 (3)
t SU (3)
t HD2 (3)
VDD
SDA
VDD
VDDR
0V
VDD
VDDR
0V
I DD
I DD
(1) Power-saving mode without 5 V supply voltage.
(2) Power-saving mode with 5 V supply voltage.
(3) t SU and t HD1 ≥ 4 μ s and t HD2 ≥ 50 μ s.
Fig.13 Timing for power-saving mode.
MLB932
I DDS
1999 Jan 06
12
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