R1EX24016ASAS0G Datasheet, PDF (6/18 Pages) Renesas Technology Corp – Two-wire serial interface 16k EEPROM

R1EX24016ASAS0G/R1EX24016ATAS0G
Pin Function
Serial Clock (SCL)
The SCL pin is used to control serial input/output data timing. The SCL input is used to positive edge clock data into
EEPROM device and negative edge clock data out of each device. Maximum clock rate is 400 kHz.
Serial Input/Output Data (SDA)
The SDA pin is bidirectional for serial data transfer. The SDA pin needs to be pulled up by resistor as that pin is open-
drain driven structure. Use proper resistor value for your system by considering V_OL, I_OL and the SDA pin capacitance.
Except for a start condition and a stop condition which will be discussed later, the SDA transition needs to be completed
during the SCL low period.
Data Validity (SDA data change timing waveform)
SCL
SDA
Data
change
Data
change
Note: High-to-low and low-to-high change of SDA should be done during the SCL low period.
Device Address (A0, A1, A2)
One device can be wired for one common data bus line as maximum. All device address are used for memory address,
corresponding device address pins must not be fixed.
Pin Connections for A0 to A2
Pin connection
Max connect
Memory size
number
A2
A1
A0
Note
16k bit
1
*¹
*¹
*¹ Use A0,A1,A2 for memory address a8,a9 and
a10
Note: 1. Floating state can be possible, because it is not connected inside.
Write Protect (WP)
When the Write Protect pin (WP) is high, the write protection feature is enabled and operates as shown in the following
table. Also, acknowledgment "0" is outputted after inputting device address and memory address. After inputting write
data, acknowledgment "1"(NO ACK) is outputted.
When the WP is low, write operation for all memory arrays are allowed. The read operation is always activated
irrespective of the WP pin status.
The WP pin is internally pulled-down to V_SS. Write operations for all memory array are allowed if unconnected.
Write Protect Area
WP pin status
V_IH
V_IL
Write protect area
16k bit
Full (16k bit)
Normal read/write operation
R10DS0032EJ0200 Rev.2.00
Feb. 13, 2013
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