PCF8570 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF8570' PDF : 20 Pages View PDF
Philips Semiconductors
256 × 8-bit static low-voltage RAM with
I2C-bus interface
Product speciï¬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).
handbook, halfpage1 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 = VDD or VDDR the PCF8570 goes into the power-saving mode and I2C-bus logic is reset.
handbook, full pagewidth
power saving
mode (1)
TEST = VDDR
operating mode
TEST
,, SCL
,,,,,, SDA
t SU (3)
,,,,,,,,tHD1(,,,,3)
VDD
IDD
power saving
mode (2)
TEST = VDD
VDD
VDDR
0V
,,,,,,,,,,,, tSU(3)
VDD
VDDR
0V
t HD2 (3)
VDD
VDDR
0V
VDD
VDDR
0V
IDD
IDDS
MLB932
(1) Power-saving mode without 5 V supply voltage.
(2) Power-saving mode with 5 V supply voltage.
(3) tSU and tHD1 ≥ 4 µs and tHD2 ≥ 50 µs.
Fig.13 Timing for power-saving mode.
1999 Jan 06
12
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