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| 型号： | DS2790G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 28/41页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE BATT 28-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TDFN |
| 供应商设备封装： | 28-TDFN-EP（8x4） |
| 包装： | 带卷 (TR) |
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DS2790 Programmable 1-Cell Li-Ion Fuel Gauge and Protector
Both the TXD and RXD FIFOs are flushed when a new command byte is accepted (command handshaking is
enabled and the TWSCMD register is not busy, or when command handshaking is disabled). In the TWS FIFO
register (TWSFIF), LRX[3:0] reports the number of received bytes waiting in the RXD FIFO and LTX[3:0] reports
the number of bytes in the TXD FIFO to be transmitted.
Timeouts and Clock Extending
Clock extending during a DS2790 receive event (master write), is applied to delay the rising edge of SCL just
before the ACK symbols after the command byte is sent, and to any ACK symbols thereafter. If the RXD FIFO is
full, the clock low time just prior to the ACK symbol will be extended until a timeout occurs or the RXD FIFO has
been read and is no longer full.
Clock extending during a DS2790 transmit event (master read), is applied to delay the rising edge of SCL just after
the ACK symbol following the address, and to any ACK symbols thereafter. If the TXD FIFO is empty, the clock low
time just after the ACK symbol will be extended until a timeout occurs or the TXD FIFO has been written and is no
longer empty.
The T TIMEOUT and T LOW:SEXT timers analyze the 2-Wire bus for timeout conditions, and can cause the TWS to reset
its internal state machine. These timers allow the bus to remain available even after bus fault conditions such as
device hot swapping. Without the timers, such scenarios could result in a bus lock-up preventing all further
communication. The T TIMEOUT timer begins counting on the falling edge of clock, and is reset on the rising edge of
clock. If the timer ever reaches the T TIMEOUT value (nominal 30ms), the clock line is released, after a short delay the
data line is also released. The T LOW:SEXT timer is reset whenever a START condition occurs on the bus. Specifically
note that the timer is not reset during a REPEATED START condition. The timer counts while the TWS is holding
the clock low. The timer does not count when a master or other slave device is holding the clock low. The timer is
stopped on a STOP condition. If the timer times out (nominal 15ms), the clock line is released, followed by the data
line.
The T TIMEOUT timer can be disabled using the TTO_DIS bit in the TWSCFG register, while T LOW:SEXT can be disabled
using the TLS_DIS bit. The TOUT_LONG bit in the TWSCFG register allows the nominal value of the timeout
conditions to be increased by a factor of four.
Command Codes
The DS2790 has two reserved command codes: a software power on reset (POR) of the IC, and an instruction to
begin program loading over the 2-wire interface. Each command code is first enabled by transmitting the
Command Enable (FEh) followed directly by a second sequence containing the command instruction. See Figure
10. There are no associated data bytes with either command. Any 2-wire communication between the two
instructions negates the operation. See the MAXQ Family User's Guide: DS2790 Supplement for the 2-wire
programming procedure. These command codes are fixed inside the DS2970 and cannot be altered. System
firmware should avoid using FEh as a command code during during device operation.
Table 11. 2-Wire Interface Command Codes
COMMAND
Command Enable
Soft POR
Request
Programming
available
HEX CODE
FEh
Repeated FEh
FDh
00h-FCh, FFh
PURPOSE
Enable soft POR or program command.
Causes a reset of the part.
Initiates programming over 2-wire interface.
Defined by application firmware.
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