参数资料
型号: DS2777G+T&R
厂商: Maxim Integrated Products
文件页数: 40/46页
文件大小: 0K
描述: IC FUEL GAUGE LI+ 2CELL 14-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)、锂聚合物(Li-Pol)
电源电压: 4 V ~ 9.2 V
工作温度: -20°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 14-WFDFN 裸露焊盘
供应商设备封装: 14-TDFN-EP(3x5)
包装: 带卷 (TR)
2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
t EEC
1-Wire
RESET
SKIP-ROM
COMMAND
CLEAR/LOCK
SECRET COMMAND
OR SET/CLEAR
WAIT FOR EEPROM
COPY TIME
OVERDRIVE COMMAND
PRESENCE
PULSE
Figure 28. Clear/Lock Secret, Set/Clear Overdrive Commands
t RSTL
t PDH
t PDL
t RSTH
PK+
DQ
PK-
LINE TYPE LEGEND:
BUS MASTER ACTIVE LOW
RESISTOR PULLUP
Figure 29. 1-Wire Initialization Sequence
1-Wire Signaling
The 1-Wire bus requires strict signaling protocols to
ensure data integrity. The four protocols used by the
DS2775/DS2776 are as follows: the initialization
sequence (reset pulse followed by presence pulse),
write-zero, write-one, and read data. The bus master
initiates all these types of signaling except the pres-
ence pulse.
DS2775/DS2776 ACTIVE LOW
Figure 29 shows the initialization sequence required to
begin any communication with the DS2775/DS2776. A
presence pulse following a reset pulse indicates that
the DS2775/DS2776 are ready to accept a Net Address
command. The bus master transmits (Tx) a reset pulse
for t RSTL . The bus master then releases the line and
goes into receive mode (Rx). The 1-Wire bus line is
then pulled high by the pullup resistor. After detecting
the rising edge on the DQ pin, the DS2775/DS2776 wait
for t PDH and then transmit the presence pulse for t PDL .
40
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