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參數(shù)資料
| 型號： | MAX7315ATE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 16TQFN-EP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 接口： | I²C，SM 總線 |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 是 |
| 頻率 - 時鐘： | 400kHz |
| 電源電壓： | 2 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
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Using PWM Intensity Controls with Blink Enabled
When blink is enabled (Table 7), the blink phase 0 regis-
ter and blink phase 1 register specify each output’s logic
level during the PWM on-time during the respective blink
phases (Tables 8 and 9). The effect of setting an output’s
blink phase X register bit to 0 or 1 is shown in Table 12.
LEDs can be flipped between either directly on and off,
or between a variety of high/low PWM intensities.
Global/O8 Intensity Control
The 4 bits used for output O8’s PWM individual intensity
setting also double as the global intensity control (Table
13). Global intensity simplifies the PWM settings when
the application requires them all to be the same, such
as for backlight applications, by replacing the 9 individ-
ual settings with 1 setting. Global intensity is enabled
with the global intensity flag G in the configuration reg-
ister (Table 4). When global PWM control is used, the 4
bits of master intensity and 4 bits of O8 intensity effec-
tively combine to provide an 8 bit, 240-step intensity
control applying to all outputs.
It is not possible to apply global PWM control to a sub-
set of the ports, and use the others as logic outputs. To
mix static logic outputs and PWM outputs, individual
PWM control must be selected (Table 10).
Applications Information
Hot Insertion
I/O ports PO-P7, interrupt output INT/08, and serial
interface SDA, SCL, AD0-2 remain high impedance with
up to 6V asserted on them when the MAX7315 is pow-
ered down (V+ = 0V). The MAX7315 can therefore be
used in hot-swap applications.
Output Level Translation
The open-drain output architecture allows the ports to
level translate the outputs to higher or lower voltages
than the MAX7315 supply. An external pullup resistor
can be used on any output to convert the high-imped-
ance logic-high condition to a positive voltage level.
The resistor can be connected to any voltage up to
5.5V. For interfacing CMOS inputs, a pullup resistor
value of 220k
is a good starting point. Use a lower
resistance to improve noise immunity, in applications
where power consumption is less critical, or where a
faster rise time is needed for a given capacitive load.
Compatibility with PCA9534 and
PCA9554(A)
The MAX7315 is pin compatible and software compatible
with PCA9534, and its variants PCA9554 and PCA9554A.
However, some PCA9534 and PCA9554(A) functions are
not implemented in the MAX7315, and the MAX7315's
PWM and blink functionality is not supported in the
PCA9534 and PCA9554(A). Software compatibility is
clearly not 100%, but the MAX7315 was designed so the
subset (omitted) features default to the same power-up
behavior as the PCA9534 and PCA9554(A), and the
superset features do not use existing registers in a differ-
ent way. In practice, many applications can use the
MAX7315 as a drop-in replacement for the PCA9534 or
PCA9554(A) with no software change.
Driving LED Loads
When driving LEDs, a resistor in series with the LED
must be used to limit the LED current to no more than
50mA. Choose the resistor value according to the fol-
lowing formula:
RLED = (VSUPPLY - VLED - VOL) / ILED
MAX7315
8-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
______________________________________________________________________________________
17
Table 8. Blink Phase 0 Register
REGISTER DATA
REGISTER
R/
W
ADDRESS
CODE
(HEX)
D7
D6
D5
D4
D3
D2
D1
D0
Write outputs phase 0
0
Read-back outputs phase 0
1
0x01
OP7
OP6
OP5
OP4
OP3
OP2
OP1
OP0
Table 9. Blink Phase 1 Register
REGISTER DATA
REGISTER
R/
W
ADDRESS
CODE
(HEX)
D7
D6
D5
D4
D3
D2
D1
D0
Write outputs phase 1
0
Read-back outputs phase 1
1
0x09
OP7
OP6
OP5
OP4
OP3
OP2
OP1
OP0
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| MAX7315AUE | 功能描述:接口-I/O擴(kuò)展器 8-Bit I/O Port Expander RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7315AUE+ | 功能描述:接口-I/O擴(kuò)展器 8-Bit I/O Port Expander RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7315AUE+T | 功能描述:接口-I/O擴(kuò)展器 8-Bit I/O Port Expander RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7315AUE-G05 | 功能描述:接口-I/O擴(kuò)展器 8-Bit I/O Port Expander RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7315AUE-T | 功能描述:接口-I/O擴(kuò)展器 8-Bit I/O Port Expander RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
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