Texas Instruments BQ27530EVM System-Side Impedance-Track Fuel (Gas) Gauge Direct Battery Connection Evaluation Module BQ BQ27530EVM 데이터 시트
제품 코드
BQ27530EVM
Host generated
A
A
S
0
ADDR[6:0]
CMD [7:0]
Sr
1
ADDR[6:0]
A
DATA [7:0]
A
DATA [7:0]
P
N
. . .
(d) incremental read
A
A
S
0
ADDR[6:0]
CMD [7:0]
Sr
1
ADDR[6:0]
A
DATA [7:0]
P
N
(c) 1- byte read
A
A
S
A
0
P
ADDR[6:0]
CMD [7:0]
DATA [7:0]
(a) 1-byte write
(b) quick read
S
1
ADDR[6:0]
A
DATA [7:0]
P
N
Gauge generated
. . .
A
A
S
A
0
P
ADDR[6:0]
CMD[7:0]
DATA [7:0]
DATA [7:0]
A
A
(e) incremental write
(S = Start , Sr = Repeated Start , A = Acknowledge , N = No Acknowledge , and P = Stop).
SLUSAL5 – DECEMBER 2012
COMMUNICATIONS
I
2
C INTERFACE
The bq27530-G1 supports the standard I
2
C read, incremental read, quick read, one byte write, and incremental
write functions. The 7 bit device address (ADDR) is the most significant 7 bits of the hex address and is fixed as
1010101. The first 8-bits of the I
1010101. The first 8-bits of the I
2
C protocol will; therefore, be 0xAA or 0xAB for write or read, respectively.
The “quick read” returns data at the address indicated by the address pointer. The address pointer, a register
internal to the I
internal to the I
2
C communication engine, will increment whenever data is acknowledged by the bq27530-G1 or
the I
2
C master. “Quick writes” function in the same manner and are a convenient means of sending multiple
bytes to consecutive command locations (such as two-byte commands that require two bytes of data)
The following command sequences are not supported:
Attempt to write a read-only address (NACK after data sent by master):
Attempt to read an address above 0x6B (NACK command):
I
2
C Time Out
The I
2
C engine will release both SDA and SCL if the I
2
C bus is held low for 2 seconds. If the bq27530-G1 was
holding the lines, releasing them will free them for the master to drive the lines. If an external condition is holding
either of the lines low, the I
either of the lines low, the I
2
C engine will enter the low power sleep mode.
Copyright © 2012, Texas Instruments Incorporated
13
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