DS1338U-18 Maxim Integrated Products, DS1338U-18 Datasheet - Page 14

• Manufacturer Part Number: DS1338U-18
• Description: IC RTC 56BYTE NV RAM 1.8V 8-USOP
• Manufacturer: Maxim Integrated Products
• Type: Clock/Calendar/NVSRAMr

Specifications of DS1338U-18

• Memory Size: 56B
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.71 V ~ 1.89 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 6. Data Write—Slave Receiver Mode
Figure 7. Data Read (From Current Pointer Location)—Slave Transmitter Mode
Figure 8. Data Read (Write Pointer, Then Read—Slave Receive and Transmit
S - START
A - ACKNOWLEDGE (ACK)
P - STOP
S
S - START
A - ACKNOWLEDGE (ACK)
P - STOP
A
- NOT ACKNOWLEDGE (NACK)
S
<Slave Address>
<Slave Address>
1101000
1101000
A - NOT ACKNOWLEDGE (NACK)
S - START
SR - REPEATED START
A - ACKNOWLEDGE (ACK)
P - STOP
XXXXXXXX
S
<Data (n)>
0
1101000
1
A
A
<Word Address (n)>
XXXXXXXX
SLAVE TO MASTER
MASTER TO SLAVE
XXXXXXXX
A
<Data (n)>
0
XXXXXXXX A XXXXXXXX A
<Data (n+1)>
SLAVE TO MASTER
MASTER TO SLAVE
A
<Word Address (n)>
XXXXXXXX
A
SLAVE TO MASTER
MASTER TO SLAVE
A
XXXXXXXX A XXXXXXXX A
<Data (n)>
XXXXXXXX A XXXXXXXX
<Data (n+1)>
14 of 16
<Data (n+2)>
A
Sr
NOTE: LAST DATA BYTE IS FOLLOWED BY A NACK
(X+1 BYTES + ACKNOWLEDGE)
<Slave Address>
DATA TRANSFERRED
1101000
<Data (n+1)>
(X+1 BYTES + ACKNOWLEDGE)
<Data (n+2)>
NOTE: LAST DATA BYTE IS FOLLOWED BY A NACK
...
DATA TRANSFERRED
1
XXXXXXXX A P
DS1338 I
<Data (n+X)>
A
(X+1 BYTES + ACKNOWLEDGE)
A
DATA TRANSFERRED
...
...
2
XXXXXXXX A P
C RTC with 56-Byte NV RAM
<Data (n+X)>
XXXXXXXX A P
<Data (n+X)>