AN2681 Freescale Semiconductor / Motorola, AN2681 Datasheet - Page 16

• Manufacturer Part Number: AN2681
• Description: 1-Wire Interface on the i.MX21 Application Processor
• Manufacturer: Freescale Semiconductor / Motorola

Summary
6 Summary
The 1-Wire interface on the i.MX21 application processor requires configuration of the MPLL, GPIO,
and AIPI registers before any 1-Wire hardware registers can be accessed. Timing requirements are crucial
for proper operation, and the 1-Wire state machine and the internal clock provide the necessary signals.
The clock must be configured to approximately 1 MHz. The user can then set the 1-Wire Control register
to send and receive bits over the 1-Wire bus.
7 Referenced Documents
16
1. DS2751 Multichemistry Battery Fuel Gauge Data Sheet, Maxim/Dallas Semiconductor
2. Lithium-Ion Cell Fuel Gauging with Dallas Semiconductor Battery Monitor ICs,
3. MC9328MX21 Chip Errat, (order number MC9328MX21CE/D)
4. MC9328MX21 Application Processor Reference Manua, (order number
5. Software for i.MX21 Application Processor 1-Wire Interface (order number AN2681SW)
1
1-Wire
Maxim/Dallas Semiconductor (order number App Note 131)
MC9328MX21RM/D)

is a registered trademark of Maxim /Dallas Semiconductor.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 3.
MC9328MX21 Application Note
Go to: www.freescale.com
Battery Capacity Calculation
1
MOTOROLA